drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_tmr.h>
  31 #include <target/target_core_transport.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_MUTEX(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_cmd_cache;
  63 struct kmem_cache *lio_qr_cache;
  64 struct kmem_cache *lio_dr_cache;
  65 struct kmem_cache *lio_ooo_cache;
  66 struct kmem_cache *lio_r2t_cache;
  67
  68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  69                         unsigned char *buf, u32);
  70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 146                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 147                 kfree(tiqn);
 148                 return ERR_PTR(-ENOMEM);
 149         }
 150         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 151
 152         spin_lock(&tiqn_lock);
 153         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 154         if (ret < 0) {
 155                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 kfree(tiqn);
 158                 return ERR_PTR(ret);
 159         }
 160         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 161         spin_unlock(&tiqn_lock);
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         if (np->np_login_tpg) {
 220                 pr_err("np->np_login_tpg() is not NULL!\n");
 221                 spin_unlock_bh(&np->np_thread_lock);
 222                 return -1;
 223         }
 224         spin_unlock_bh(&np->np_thread_lock);
 225         /*
 226          * Determine if the portal group is accepting storage traffic.
 227          */
 228         spin_lock_bh(&tpg->tpg_state_lock);
 229         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 230                 spin_unlock_bh(&tpg->tpg_state_lock);
 231                 return -1;
 232         }
 233         spin_unlock_bh(&tpg->tpg_state_lock);
 234
 235         /*
 236          * Here we serialize access across the TIQN+TPG Tuple.
 237          */
 238         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 239         if ((ret != 0) || signal_pending(current))
 240                 return -1;
 241
 242         spin_lock_bh(&np->np_thread_lock);
 243         np->np_login_tpg = tpg;
 244         spin_unlock_bh(&np->np_thread_lock);
 245
 246         return 0;
 247 }
 248
 249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         spin_lock_bh(&np->np_thread_lock);
 254         np->np_login_tpg = NULL;
 255         spin_unlock_bh(&np->np_thread_lock);
 256
 257         mutex_unlock(&tpg->np_login_lock);
 258
 259         if (tiqn)
 260                 iscsit_put_tiqn_for_login(tiqn);
 261
 262         return 0;
 263 }
 264
 265 /*
 266  * Called with mutex np_lock held
 267  */
 268 static struct iscsi_np *iscsit_get_np(
 269         struct __kernel_sockaddr_storage *sockaddr,
 270         int network_transport)
 271 {
 272         struct sockaddr_in *sock_in, *sock_in_e;
 273         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 274         struct iscsi_np *np;
 275         int ip_match = 0;
 276         u16 port;
 277
 278         list_for_each_entry(np, &g_np_list, np_list) {
 279                 spin_lock_bh(&np->np_thread_lock);
 280                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 281                         spin_unlock_bh(&np->np_thread_lock);
 282                         continue;
 283                 }
 284
 285                 if (sockaddr->ss_family == AF_INET6) {
 286                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 287                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 288
 289                         if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
 290                                     (void *)&sock_in6_e->sin6_addr.in6_u,
 291                                     sizeof(struct in6_addr)))
 292                                 ip_match = 1;
 293
 294                         port = ntohs(sock_in6->sin6_port);
 295                 } else {
 296                         sock_in = (struct sockaddr_in *)sockaddr;
 297                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 298
 299                         if (sock_in->sin_addr.s_addr ==
 300                             sock_in_e->sin_addr.s_addr)
 301                                 ip_match = 1;
 302
 303                         port = ntohs(sock_in->sin_port);
 304                 }
 305
 306                 if ((ip_match == 1) && (np->np_port == port) &&
 307                     (np->np_network_transport == network_transport)) {
 308                         /*
 309                          * Increment the np_exports reference count now to
 310                          * prevent iscsit_del_np() below from being called
 311                          * while iscsi_tpg_add_network_portal() is called.
 312                          */
 313                         np->np_exports++;
 314                         spin_unlock_bh(&np->np_thread_lock);
 315                         return np;
 316                 }
 317                 spin_unlock_bh(&np->np_thread_lock);
 318         }
 319
 320         return NULL;
 321 }
 322
 323 struct iscsi_np *iscsit_add_np(
 324         struct __kernel_sockaddr_storage *sockaddr,
 325         char *ip_str,
 326         int network_transport)
 327 {
 328         struct sockaddr_in *sock_in;
 329         struct sockaddr_in6 *sock_in6;
 330         struct iscsi_np *np;
 331         int ret;
 332
 333         mutex_lock(&np_lock);
 334
 335         /*
 336          * Locate the existing struct iscsi_np if already active..
 337          */
 338         np = iscsit_get_np(sockaddr, network_transport);
 339         if (np) {
 340                 mutex_unlock(&np_lock);
 341                 return np;
 342         }
 343
 344         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 345         if (!np) {
 346                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 347                 mutex_unlock(&np_lock);
 348                 return ERR_PTR(-ENOMEM);
 349         }
 350
 351         np->np_flags |= NPF_IP_NETWORK;
 352         if (sockaddr->ss_family == AF_INET6) {
 353                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 354                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 355                 np->np_port = ntohs(sock_in6->sin6_port);
 356         } else {
 357                 sock_in = (struct sockaddr_in *)sockaddr;
 358                 sprintf(np->np_ip, "%s", ip_str);
 359                 np->np_port = ntohs(sock_in->sin_port);
 360         }
 361
 362         np->np_network_transport = network_transport;
 363         spin_lock_init(&np->np_thread_lock);
 364         init_completion(&np->np_restart_comp);
 365         INIT_LIST_HEAD(&np->np_list);
 366
 367         ret = iscsi_target_setup_login_socket(np, sockaddr);
 368         if (ret != 0) {
 369                 kfree(np);
 370                 mutex_unlock(&np_lock);
 371                 return ERR_PTR(ret);
 372         }
 373
 374         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 375         if (IS_ERR(np->np_thread)) {
 376                 pr_err("Unable to create kthread: iscsi_np\n");
 377                 ret = PTR_ERR(np->np_thread);
 378                 kfree(np);
 379                 mutex_unlock(&np_lock);
 380                 return ERR_PTR(ret);
 381         }
 382         /*
 383          * Increment the np_exports reference count now to prevent
 384          * iscsit_del_np() below from being run while a new call to
 385          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 386          * active.  We don't need to hold np->np_thread_lock at this
 387          * point because iscsi_np has not been added to g_np_list yet.
 388          */
 389         np->np_exports = 1;
 390         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 391
 392         list_add_tail(&np->np_list, &g_np_list);
 393         mutex_unlock(&np_lock);
 394
 395         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 396                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 397                 "TCP" : "SCTP");
 398
 399         return np;
 400 }
 401
 402 int iscsit_reset_np_thread(
 403         struct iscsi_np *np,
 404         struct iscsi_tpg_np *tpg_np,
 405         struct iscsi_portal_group *tpg)
 406 {
 407         spin_lock_bh(&np->np_thread_lock);
 408         if (tpg && tpg_np) {
 409                 /*
 410                  * The reset operation need only be performed when the
 411                  * passed struct iscsi_portal_group has a login in progress
 412                  * to one of the network portals.
 413                  */
 414                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 415                         spin_unlock_bh(&np->np_thread_lock);
 416                         return 0;
 417                 }
 418         }
 419         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 420                 spin_unlock_bh(&np->np_thread_lock);
 421                 return 0;
 422         }
 423         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 424
 425         if (np->np_thread) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 send_sig(SIGINT, np->np_thread, 1);
 428                 wait_for_completion(&np->np_restart_comp);
 429                 spin_lock_bh(&np->np_thread_lock);
 430         }
 431         spin_unlock_bh(&np->np_thread_lock);
 432
 433         return 0;
 434 }
 435
 436 int iscsit_del_np_comm(struct iscsi_np *np)
 437 {
 438         if (np->np_socket)
 439                 sock_release(np->np_socket);
 440         return 0;
 441 }
 442
 443 int iscsit_del_np(struct iscsi_np *np)
 444 {
 445         spin_lock_bh(&np->np_thread_lock);
 446         np->np_exports--;
 447         if (np->np_exports) {
 448                 spin_unlock_bh(&np->np_thread_lock);
 449                 return 0;
 450         }
 451         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 452         spin_unlock_bh(&np->np_thread_lock);
 453
 454         if (np->np_thread) {
 455                 /*
 456                  * We need to send the signal to wakeup Linux/Net
 457                  * which may be sleeping in sock_accept()..
 458                  */
 459                 send_sig(SIGINT, np->np_thread, 1);
 460                 kthread_stop(np->np_thread);
 461         }
 462         iscsit_del_np_comm(np);
 463
 464         mutex_lock(&np_lock);
 465         list_del(&np->np_list);
 466         mutex_unlock(&np_lock);
 467
 468         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 469                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 470                 "TCP" : "SCTP");
 471
 472         kfree(np);
 473         return 0;
 474 }
 475
 476 static int __init iscsi_target_init_module(void)
 477 {
 478         int ret = 0;
 479
 480         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 481
 482         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 483         if (!iscsit_global) {
 484                 pr_err("Unable to allocate memory for iscsit_global\n");
 485                 return -1;
 486         }
 487         mutex_init(&auth_id_lock);
 488         spin_lock_init(&sess_idr_lock);
 489         idr_init(&tiqn_idr);
 490         idr_init(&sess_idr);
 491
 492         ret = iscsi_target_register_configfs();
 493         if (ret < 0)
 494                 goto out;
 495
 496         ret = iscsi_thread_set_init();
 497         if (ret < 0)
 498                 goto configfs_out;
 499
 500         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 501                         TARGET_THREAD_SET_COUNT) {
 502                 pr_err("iscsi_allocate_thread_sets() returned"
 503                         " unexpected value!\n");
 504                 goto ts_out1;
 505         }
 506
 507         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 508                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 509                         0, NULL);
 510         if (!lio_cmd_cache) {
 511                 pr_err("Unable to kmem_cache_create() for"
 512                                 " lio_cmd_cache\n");
 513                 goto ts_out2;
 514         }
 515
 516         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 517                         sizeof(struct iscsi_queue_req),
 518                         __alignof__(struct iscsi_queue_req), 0, NULL);
 519         if (!lio_qr_cache) {
 520                 pr_err("nable to kmem_cache_create() for"
 521                                 " lio_qr_cache\n");
 522                 goto cmd_out;
 523         }
 524
 525         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 526                         sizeof(struct iscsi_datain_req),
 527                         __alignof__(struct iscsi_datain_req), 0, NULL);
 528         if (!lio_dr_cache) {
 529                 pr_err("Unable to kmem_cache_create() for"
 530                                 " lio_dr_cache\n");
 531                 goto qr_out;
 532         }
 533
 534         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 535                         sizeof(struct iscsi_ooo_cmdsn),
 536                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 537         if (!lio_ooo_cache) {
 538                 pr_err("Unable to kmem_cache_create() for"
 539                                 " lio_ooo_cache\n");
 540                 goto dr_out;
 541         }
 542
 543         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 544                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 545                         0, NULL);
 546         if (!lio_r2t_cache) {
 547                 pr_err("Unable to kmem_cache_create() for"
 548                                 " lio_r2t_cache\n");
 549                 goto ooo_out;
 550         }
 551
 552         if (iscsit_load_discovery_tpg() < 0)
 553                 goto r2t_out;
 554
 555         return ret;
 556 r2t_out:
 557         kmem_cache_destroy(lio_r2t_cache);
 558 ooo_out:
 559         kmem_cache_destroy(lio_ooo_cache);
 560 dr_out:
 561         kmem_cache_destroy(lio_dr_cache);
 562 qr_out:
 563         kmem_cache_destroy(lio_qr_cache);
 564 cmd_out:
 565         kmem_cache_destroy(lio_cmd_cache);
 566 ts_out2:
 567         iscsi_deallocate_thread_sets();
 568 ts_out1:
 569         iscsi_thread_set_free();
 570 configfs_out:
 571         iscsi_target_deregister_configfs();
 572 out:
 573         kfree(iscsit_global);
 574         return -ENOMEM;
 575 }
 576
 577 static void __exit iscsi_target_cleanup_module(void)
 578 {
 579         iscsi_deallocate_thread_sets();
 580         iscsi_thread_set_free();
 581         iscsit_release_discovery_tpg();
 582         kmem_cache_destroy(lio_cmd_cache);
 583         kmem_cache_destroy(lio_qr_cache);
 584         kmem_cache_destroy(lio_dr_cache);
 585         kmem_cache_destroy(lio_ooo_cache);
 586         kmem_cache_destroy(lio_r2t_cache);
 587
 588         iscsi_target_deregister_configfs();
 589
 590         kfree(iscsit_global);
 591 }
 592
 593 int iscsit_add_reject(
 594         u8 reason,
 595         int fail_conn,
 596         unsigned char *buf,
 597         struct iscsi_conn *conn)
 598 {
 599         struct iscsi_cmd *cmd;
 600         struct iscsi_reject *hdr;
 601         int ret;
 602
 603         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 604         if (!cmd)
 605                 return -1;
 606
 607         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 608         if (fail_conn)
 609                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 610
 611         hdr     = (struct iscsi_reject *) cmd->pdu;
 612         hdr->reason = reason;
 613
 614         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 615         if (!cmd->buf_ptr) {
 616                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 617                 iscsit_release_cmd(cmd);
 618                 return -1;
 619         }
 620
 621         spin_lock_bh(&conn->cmd_lock);
 622         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 623         spin_unlock_bh(&conn->cmd_lock);
 624
 625         cmd->i_state = ISTATE_SEND_REJECT;
 626         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 627
 628         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 629         if (ret != 0)
 630                 return -1;
 631
 632         return (!fail_conn) ? 0 : -1;
 633 }
 634
 635 int iscsit_add_reject_from_cmd(
 636         u8 reason,
 637         int fail_conn,
 638         int add_to_conn,
 639         unsigned char *buf,
 640         struct iscsi_cmd *cmd)
 641 {
 642         struct iscsi_conn *conn;
 643         struct iscsi_reject *hdr;
 644         int ret;
 645
 646         if (!cmd->conn) {
 647                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 648                                 cmd->init_task_tag);
 649                 return -1;
 650         }
 651         conn = cmd->conn;
 652
 653         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 654         if (fail_conn)
 655                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 656
 657         hdr     = (struct iscsi_reject *) cmd->pdu;
 658         hdr->reason = reason;
 659
 660         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 661         if (!cmd->buf_ptr) {
 662                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 663                 iscsit_release_cmd(cmd);
 664                 return -1;
 665         }
 666
 667         if (add_to_conn) {
 668                 spin_lock_bh(&conn->cmd_lock);
 669                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 670                 spin_unlock_bh(&conn->cmd_lock);
 671         }
 672
 673         cmd->i_state = ISTATE_SEND_REJECT;
 674         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 675
 676         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 677         if (ret != 0)
 678                 return -1;
 679
 680         return (!fail_conn) ? 0 : -1;
 681 }
 682
 683 /*
 684  * Map some portion of the allocated scatterlist to an iovec, suitable for
 685  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 686  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 687  * either case (see iscsit_alloc_buffs)
 688  */
 689 static int iscsit_map_iovec(
 690         struct iscsi_cmd *cmd,
 691         struct kvec *iov,
 692         u32 data_offset,
 693         u32 data_length)
 694 {
 695         u32 i = 0;
 696         struct scatterlist *sg;
 697         unsigned int page_off;
 698
 699         /*
 700          * We have a private mapping of the allocated pages in t_mem_sg.
 701          * At this point, we also know each contains a page.
 702          */
 703         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 704         page_off = (data_offset % PAGE_SIZE);
 705
 706         cmd->first_data_sg = sg;
 707         cmd->first_data_sg_off = page_off;
 708
 709         while (data_length) {
 710                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 711
 712                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 713                 iov[i].iov_len = cur_len;
 714
 715                 data_length -= cur_len;
 716                 page_off = 0;
 717                 sg = sg_next(sg);
 718                 i++;
 719         }
 720
 721         cmd->kmapped_nents = i;
 722
 723         return i;
 724 }
 725
 726 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 727 {
 728         u32 i;
 729         struct scatterlist *sg;
 730
 731         sg = cmd->first_data_sg;
 732
 733         for (i = 0; i < cmd->kmapped_nents; i++)
 734                 kunmap(sg_page(&sg[i]));
 735 }
 736
 737 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 738 {
 739         struct iscsi_cmd *cmd;
 740
 741         conn->exp_statsn = exp_statsn;
 742
 743         spin_lock_bh(&conn->cmd_lock);
 744         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
 745                 spin_lock(&cmd->istate_lock);
 746                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 747                     (cmd->stat_sn < exp_statsn)) {
 748                         cmd->i_state = ISTATE_REMOVE;
 749                         spin_unlock(&cmd->istate_lock);
 750                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 751                                                 cmd->i_state);
 752                         continue;
 753                 }
 754                 spin_unlock(&cmd->istate_lock);
 755         }
 756         spin_unlock_bh(&conn->cmd_lock);
 757 }
 758
 759 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 760 {
 761         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 762                                 cmd->se_cmd.t_data_nents;
 763
 764         iov_count += ISCSI_IOV_DATA_BUFFER;
 765
 766         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 767         if (!cmd->iov_data) {
 768                 pr_err("Unable to allocate cmd->iov_data\n");
 769                 return -ENOMEM;
 770         }
 771
 772         cmd->orig_iov_data_count = iov_count;
 773         return 0;
 774 }
 775
 776 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 777 {
 778         struct scatterlist *sgl;
 779         u32 length = cmd->se_cmd.data_length;
 780         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 781         int i = 0, j = 0, ret;
 782         /*
 783          * If no SCSI payload is present, allocate the default iovecs used for
 784          * iSCSI PDU Header
 785          */
 786         if (!length)
 787                 return iscsit_allocate_iovecs(cmd);
 788
 789         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 790         if (!sgl)
 791                 return -ENOMEM;
 792
 793         sg_init_table(sgl, nents);
 794
 795         while (length) {
 796                 int buf_size = min_t(int, length, PAGE_SIZE);
 797                 struct page *page;
 798
 799                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 800                 if (!page)
 801                         goto page_alloc_failed;
 802
 803                 sg_set_page(&sgl[i], page, buf_size, 0);
 804
 805                 length -= buf_size;
 806                 i++;
 807         }
 808
 809         cmd->t_mem_sg = sgl;
 810         cmd->t_mem_sg_nents = nents;
 811
 812         /* BIDI ops not supported */
 813
 814         /* Tell the core about our preallocated memory */
 815         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 816         /*
 817          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 818          * so that cmd->se_cmd.t_tasks_se_num has been set.
 819          */
 820         ret = iscsit_allocate_iovecs(cmd);
 821         if (ret < 0)
 822                 return -ENOMEM;
 823
 824         return 0;
 825
 826 page_alloc_failed:
 827         while (j < i)
 828                 __free_page(sg_page(&sgl[j++]));
 829
 830         kfree(sgl);
 831         return -ENOMEM;
 832 }
 833
 834 static int iscsit_handle_scsi_cmd(
 835         struct iscsi_conn *conn,
 836         unsigned char *buf)
 837 {
 838         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 839         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 840         struct iscsi_cmd        *cmd = NULL;
 841         struct iscsi_scsi_req *hdr;
 842
 843         spin_lock_bh(&conn->sess->session_stats_lock);
 844         conn->sess->cmd_pdus++;
 845         if (conn->sess->se_sess->se_node_acl) {
 846                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 847                 conn->sess->se_sess->se_node_acl->num_cmds++;
 848                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 849         }
 850         spin_unlock_bh(&conn->sess->session_stats_lock);
 851
 852         hdr                     = (struct iscsi_scsi_req *) buf;
 853         payload_length          = ntoh24(hdr->dlength);
 854         hdr->itt                = be32_to_cpu(hdr->itt);
 855         hdr->data_length        = be32_to_cpu(hdr->data_length);
 856         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 857         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 858
 859         /* FIXME; Add checks for AdditionalHeaderSegment */
 860
 861         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 862             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 863                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 864                                 " not set. Bad iSCSI Initiator.\n");
 865                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 866                                 buf, conn);
 867         }
 868
 869         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 870              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 871                 /*
 872                  * From RFC-3720 Section 10.3.1:
 873                  *
 874                  * "Either or both of R and W MAY be 1 when either the
 875                  *  Expected Data Transfer Length and/or Bidirectional Read
 876                  *  Expected Data Transfer Length are 0"
 877                  *
 878                  * For this case, go ahead and clear the unnecssary bits
 879                  * to avoid any confusion with ->data_direction.
 880                  */
 881                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 882                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 883
 884                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 885                         " set when Expected Data Transfer Length is 0 for"
 886                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 887         }
 888
 889         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 890             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 891                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 892                         " MUST be set if Expected Data Transfer Length is not 0."
 893                         " Bad iSCSI Initiator\n");
 894                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 895                                 buf, conn);
 896         }
 897
 898         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 899             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 900                 pr_err("Bidirectional operations not supported!\n");
 901                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 902                                 buf, conn);
 903         }
 904
 905         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 906                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 907                                 " Scsi Command PDU.\n");
 908                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 909                                 buf, conn);
 910         }
 911
 912         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 913                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 914                         " protocol error.\n", payload_length);
 915                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 916                                 buf, conn);
 917         }
 918
 919         if ((hdr->data_length == payload_length) &&
 920             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 921                 pr_err("Expected Data Transfer Length and Length of"
 922                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 923                         " bit is not set protocol error\n");
 924                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 925                                 buf, conn);
 926         }
 927
 928         if (payload_length > hdr->data_length) {
 929                 pr_err("DataSegmentLength: %u is greater than"
 930                         " EDTL: %u, protocol error.\n", payload_length,
 931                                 hdr->data_length);
 932                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 933                                 buf, conn);
 934         }
 935
 936         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 937                 pr_err("DataSegmentLength: %u is greater than"
 938                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 939                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 940                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 941                                 buf, conn);
 942         }
 943
 944         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 945                 pr_err("DataSegmentLength: %u is greater than"
 946                         " FirstBurstLength: %u, protocol error.\n",
 947                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 948                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 949                                         buf, conn);
 950         }
 951
 952         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 953                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 954                           DMA_NONE;
 955
 956         cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
 957                                 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
 958         if (!cmd)
 959                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 960                                         buf, conn);
 961
 962         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 963                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 964                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 965
 966         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 967         cmd->i_state            = ISTATE_NEW_CMD;
 968         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 969         cmd->immediate_data     = (payload_length) ? 1 : 0;
 970         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 971                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 972         if (cmd->unsolicited_data)
 973                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 974
 975         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 976         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 977                 spin_lock_bh(&conn->sess->ttt_lock);
 978                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 979                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 980                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 981                 spin_unlock_bh(&conn->sess->ttt_lock);
 982         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 983                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 984         cmd->cmd_sn             = hdr->cmdsn;
 985         cmd->exp_stat_sn        = hdr->exp_statsn;
 986         cmd->first_burst_len    = payload_length;
 987
 988         if (cmd->data_direction == DMA_FROM_DEVICE) {
 989                 struct iscsi_datain_req *dr;
 990
 991                 dr = iscsit_allocate_datain_req();
 992                 if (!dr)
 993                         return iscsit_add_reject_from_cmd(
 994                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 995                                         1, 1, buf, cmd);
 996
 997                 iscsit_attach_datain_req(cmd, dr);
 998         }
 999
1000         /*
1001          * The CDB is going to an se_device_t.
1002          */
1003         ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1004                                 get_unaligned_le64(&hdr->lun));
1005         if (ret < 0) {
1006                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1007                         pr_debug("Responding to non-acl'ed,"
1008                                 " non-existent or non-exported iSCSI LUN:"
1009                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1010                 }
1011                 send_check_condition = 1;
1012                 goto attach_cmd;
1013         }
1014         /*
1015          * The Initiator Node has access to the LUN (the addressing method
1016          * is handled inside of iscsit_get_lun_for_cmd()).  Now it's time to
1017          * allocate 1->N transport tasks (depending on sector count and
1018          * maximum request size the physical HBA(s) can handle.
1019          */
1020         transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1021         if (transport_ret == -ENOMEM) {
1022                 return iscsit_add_reject_from_cmd(
1023                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1024                                 1, 1, buf, cmd);
1025         } else if (transport_ret < 0) {
1026                 /*
1027                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1028                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1029                  * Mechinism.
1030                  */
1031                 send_check_condition = 1;
1032         } else {
1033                 cmd->data_length = cmd->se_cmd.data_length;
1034
1035                 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1036                         return iscsit_add_reject_from_cmd(
1037                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1038                                 1, 1, buf, cmd);
1039         }
1040
1041 attach_cmd:
1042         spin_lock_bh(&conn->cmd_lock);
1043         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1044         spin_unlock_bh(&conn->cmd_lock);
1045         /*
1046          * Check if we need to delay processing because of ALUA
1047          * Active/NonOptimized primary access state..
1048          */
1049         core_alua_check_nonop_delay(&cmd->se_cmd);
1050         /*
1051          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1052          * also call iscsit_allocate_iovecs()
1053          */
1054         ret = iscsit_alloc_buffs(cmd);
1055         if (ret < 0)
1056                 return iscsit_add_reject_from_cmd(
1057                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1058                                 1, 0, buf, cmd);
1059         /*
1060          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1061          * the Immediate Bit is not set, and no Immediate
1062          * Data is attached.
1063          *
1064          * A PDU/CmdSN carrying Immediate Data can only
1065          * be processed after the DataCRC has passed.
1066          * If the DataCRC fails, the CmdSN MUST NOT
1067          * be acknowledged. (See below)
1068          */
1069         if (!cmd->immediate_data) {
1070                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1071                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1072                         return 0;
1073                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1074                         return iscsit_add_reject_from_cmd(
1075                                 ISCSI_REASON_PROTOCOL_ERROR,
1076                                 1, 0, buf, cmd);
1077         }
1078
1079         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1080
1081         /*
1082          * If no Immediate Data is attached, it's OK to return now.
1083          */
1084         if (!cmd->immediate_data) {
1085                 if (send_check_condition)
1086                         return 0;
1087
1088                 if (cmd->unsolicited_data) {
1089                         iscsit_set_dataout_sequence_values(cmd);
1090
1091                         spin_lock_bh(&cmd->dataout_timeout_lock);
1092                         iscsit_start_dataout_timer(cmd, cmd->conn);
1093                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1094                 }
1095
1096                 return 0;
1097         }
1098
1099         /*
1100          * Early CHECK_CONDITIONs never make it to the transport processing
1101          * thread.  They are processed in CmdSN order by
1102          * iscsit_check_received_cmdsn() below.
1103          */
1104         if (send_check_condition) {
1105                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1106                 dump_immediate_data = 1;
1107                 goto after_immediate_data;
1108         }
1109         /*
1110          * Call directly into transport_generic_new_cmd() to perform
1111          * the backend memory allocation.
1112          */
1113         ret = transport_generic_new_cmd(&cmd->se_cmd);
1114         if (ret < 0) {
1115                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1116                 dump_immediate_data = 1;
1117                 goto after_immediate_data;
1118         }
1119
1120         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1121 after_immediate_data:
1122         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1123                 /*
1124                  * A PDU/CmdSN carrying Immediate Data passed
1125                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1126                  * Immediate Bit is not set.
1127                  */
1128                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1129                 /*
1130                  * Special case for Unsupported SAM WRITE Opcodes
1131                  * and ImmediateData=Yes.
1132                  */
1133                 if (dump_immediate_data) {
1134                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1135                                 return -1;
1136                 } else if (cmd->unsolicited_data) {
1137                         iscsit_set_dataout_sequence_values(cmd);
1138
1139                         spin_lock_bh(&cmd->dataout_timeout_lock);
1140                         iscsit_start_dataout_timer(cmd, cmd->conn);
1141                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1142                 }
1143
1144                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1145                         return iscsit_add_reject_from_cmd(
1146                                 ISCSI_REASON_PROTOCOL_ERROR,
1147                                 1, 0, buf, cmd);
1148
1149         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1150                 /*
1151                  * Immediate Data failed DataCRC and ERL>=1,
1152                  * silently drop this PDU and let the initiator
1153                  * plug the CmdSN gap.
1154                  *
1155                  * FIXME: Send Unsolicited NOPIN with reserved
1156                  * TTT here to help the initiator figure out
1157                  * the missing CmdSN, although they should be
1158                  * intelligent enough to determine the missing
1159                  * CmdSN and issue a retry to plug the sequence.
1160                  */
1161                 cmd->i_state = ISTATE_REMOVE;
1162                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1163         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1164                 return -1;
1165
1166         return 0;
1167 }
1168
1169 static u32 iscsit_do_crypto_hash_sg(
1170         struct hash_desc *hash,
1171         struct iscsi_cmd *cmd,
1172         u32 data_offset,
1173         u32 data_length,
1174         u32 padding,
1175         u8 *pad_bytes)
1176 {
1177         u32 data_crc;
1178         u32 i;
1179         struct scatterlist *sg;
1180         unsigned int page_off;
1181
1182         crypto_hash_init(hash);
1183
1184         sg = cmd->first_data_sg;
1185         page_off = cmd->first_data_sg_off;
1186
1187         i = 0;
1188         while (data_length) {
1189                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1190
1191                 crypto_hash_update(hash, &sg[i], cur_len);
1192
1193                 data_length -= cur_len;
1194                 page_off = 0;
1195                 i++;
1196         }
1197
1198         if (padding) {
1199                 struct scatterlist pad_sg;
1200
1201                 sg_init_one(&pad_sg, pad_bytes, padding);
1202                 crypto_hash_update(hash, &pad_sg, padding);
1203         }
1204         crypto_hash_final(hash, (u8 *) &data_crc);
1205
1206         return data_crc;
1207 }
1208
1209 static void iscsit_do_crypto_hash_buf(
1210         struct hash_desc *hash,
1211         unsigned char *buf,
1212         u32 payload_length,
1213         u32 padding,
1214         u8 *pad_bytes,
1215         u8 *data_crc)
1216 {
1217         struct scatterlist sg;
1218
1219         crypto_hash_init(hash);
1220
1221         sg_init_one(&sg, (u8 *)buf, payload_length);
1222         crypto_hash_update(hash, &sg, payload_length);
1223
1224         if (padding) {
1225                 sg_init_one(&sg, pad_bytes, padding);
1226                 crypto_hash_update(hash, &sg, padding);
1227         }
1228         crypto_hash_final(hash, data_crc);
1229 }
1230
1231 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1232 {
1233         int iov_ret, ooo_cmdsn = 0, ret;
1234         u8 data_crc_failed = 0;
1235         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1236         u32 rx_size = 0, payload_length;
1237         struct iscsi_cmd *cmd = NULL;
1238         struct se_cmd *se_cmd;
1239         struct iscsi_data *hdr;
1240         struct kvec *iov;
1241         unsigned long flags;
1242
1243         hdr                     = (struct iscsi_data *) buf;
1244         payload_length          = ntoh24(hdr->dlength);
1245         hdr->itt                = be32_to_cpu(hdr->itt);
1246         hdr->ttt                = be32_to_cpu(hdr->ttt);
1247         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1248         hdr->datasn             = be32_to_cpu(hdr->datasn);
1249         hdr->offset             = be32_to_cpu(hdr->offset);
1250
1251         if (!payload_length) {
1252                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1253                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1254                                         buf, conn);
1255         }
1256
1257         /* iSCSI write */
1258         spin_lock_bh(&conn->sess->session_stats_lock);
1259         conn->sess->rx_data_octets += payload_length;
1260         if (conn->sess->se_sess->se_node_acl) {
1261                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1262                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1263                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1264         }
1265         spin_unlock_bh(&conn->sess->session_stats_lock);
1266
1267         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1268                 pr_err("DataSegmentLength: %u is greater than"
1269                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1270                         conn->conn_ops->MaxRecvDataSegmentLength);
1271                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1272                                         buf, conn);
1273         }
1274
1275         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1276                         payload_length);
1277         if (!cmd)
1278                 return 0;
1279
1280         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1281                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1282                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1283                 payload_length, conn->cid);
1284
1285         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1286                 pr_err("Command ITT: 0x%08x received DataOUT after"
1287                         " last DataOUT received, dumping payload\n",
1288                         cmd->init_task_tag);
1289                 return iscsit_dump_data_payload(conn, payload_length, 1);
1290         }
1291
1292         if (cmd->data_direction != DMA_TO_DEVICE) {
1293                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1294                         " NON-WRITE command.\n", cmd->init_task_tag);
1295                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1296                                 1, 0, buf, cmd);
1297         }
1298         se_cmd = &cmd->se_cmd;
1299         iscsit_mod_dataout_timer(cmd);
1300
1301         if ((hdr->offset + payload_length) > cmd->data_length) {
1302                 pr_err("DataOut Offset: %u, Length %u greater than"
1303                         " iSCSI Command EDTL %u, protocol error.\n",
1304                         hdr->offset, payload_length, cmd->data_length);
1305                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1306                                 1, 0, buf, cmd);
1307         }
1308
1309         if (cmd->unsolicited_data) {
1310                 int dump_unsolicited_data = 0;
1311
1312                 if (conn->sess->sess_ops->InitialR2T) {
1313                         pr_err("Received unexpected unsolicited data"
1314                                 " while InitialR2T=Yes, protocol error.\n");
1315                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1316                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1317                         return -1;
1318                 }
1319                 /*
1320                  * Special case for dealing with Unsolicited DataOUT
1321                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1322                  * failures;
1323                  */
1324
1325                 /* Something's amiss if we're not in WRITE_PENDING state... */
1326                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1327                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1328                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1329
1330                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1331                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1332                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1333                         dump_unsolicited_data = 1;
1334                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1335
1336                 if (dump_unsolicited_data) {
1337                         /*
1338                          * Check if a delayed TASK_ABORTED status needs to
1339                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1340                          * received with the unsolicitied data out.
1341                          */
1342                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1343                                 iscsit_stop_dataout_timer(cmd);
1344
1345                         transport_check_aborted_status(se_cmd,
1346                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1347                         return iscsit_dump_data_payload(conn, payload_length, 1);
1348                 }
1349         } else {
1350                 /*
1351                  * For the normal solicited data path:
1352                  *
1353                  * Check for a delayed TASK_ABORTED status and dump any
1354                  * incoming data out payload if one exists.  Also, when the
1355                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1356                  * data out sequence, we decrement outstanding_r2ts.  Once
1357                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1358                  * TASK_ABORTED status.
1359                  */
1360                 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1361                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1362                                 if (--cmd->outstanding_r2ts < 1) {
1363                                         iscsit_stop_dataout_timer(cmd);
1364                                         transport_check_aborted_status(
1365                                                         se_cmd, 1);
1366                                 }
1367
1368                         return iscsit_dump_data_payload(conn, payload_length, 1);
1369                 }
1370         }
1371         /*
1372          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1373          * within-command recovery checks before receiving the payload.
1374          */
1375         ret = iscsit_check_pre_dataout(cmd, buf);
1376         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1377                 return 0;
1378         else if (ret == DATAOUT_CANNOT_RECOVER)
1379                 return -1;
1380
1381         rx_size += payload_length;
1382         iov = &cmd->iov_data[0];
1383
1384         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1385         if (iov_ret < 0)
1386                 return -1;
1387
1388         iov_count += iov_ret;
1389
1390         padding = ((-payload_length) & 3);
1391         if (padding != 0) {
1392                 iov[iov_count].iov_base = cmd->pad_bytes;
1393                 iov[iov_count++].iov_len = padding;
1394                 rx_size += padding;
1395                 pr_debug("Receiving %u padding bytes.\n", padding);
1396         }
1397
1398         if (conn->conn_ops->DataDigest) {
1399                 iov[iov_count].iov_base = &checksum;
1400                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1401                 rx_size += ISCSI_CRC_LEN;
1402         }
1403
1404         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1405
1406         iscsit_unmap_iovec(cmd);
1407
1408         if (rx_got != rx_size)
1409                 return -1;
1410
1411         if (conn->conn_ops->DataDigest) {
1412                 u32 data_crc;
1413
1414                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1415                                                     hdr->offset, payload_length, padding,
1416                                                     cmd->pad_bytes);
1417
1418                 if (checksum != data_crc) {
1419                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1420                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1421                                 " does not match computed 0x%08x\n",
1422                                 hdr->itt, hdr->offset, payload_length,
1423                                 hdr->datasn, checksum, data_crc);
1424                         data_crc_failed = 1;
1425                 } else {
1426                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1427                                 " %u bytes of Data Out\n", checksum,
1428                                 payload_length);
1429                 }
1430         }
1431         /*
1432          * Increment post receive data and CRC values or perform
1433          * within-command recovery.
1434          */
1435         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1436         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1437                 return 0;
1438         else if (ret == DATAOUT_SEND_R2T) {
1439                 iscsit_set_dataout_sequence_values(cmd);
1440                 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1441         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1442                 /*
1443                  * Handle extra special case for out of order
1444                  * Unsolicited Data Out.
1445                  */
1446                 spin_lock_bh(&cmd->istate_lock);
1447                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1448                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1449                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1450                 spin_unlock_bh(&cmd->istate_lock);
1451
1452                 iscsit_stop_dataout_timer(cmd);
1453                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1454                                         &cmd->se_cmd) : 0;
1455         } else /* DATAOUT_CANNOT_RECOVER */
1456                 return -1;
1457
1458         return 0;
1459 }
1460
1461 static int iscsit_handle_nop_out(
1462         struct iscsi_conn *conn,
1463         unsigned char *buf)
1464 {
1465         unsigned char *ping_data = NULL;
1466         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1467         u32 checksum, data_crc, padding = 0, payload_length;
1468         u64 lun;
1469         struct iscsi_cmd *cmd = NULL;
1470         struct kvec *iov = NULL;
1471         struct iscsi_nopout *hdr;
1472
1473         hdr                     = (struct iscsi_nopout *) buf;
1474         payload_length          = ntoh24(hdr->dlength);
1475         lun                     = get_unaligned_le64(&hdr->lun);
1476         hdr->itt                = be32_to_cpu(hdr->itt);
1477         hdr->ttt                = be32_to_cpu(hdr->ttt);
1478         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1479         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1480
1481         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1482                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1483                         " not set, protocol error.\n");
1484                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1485                                         buf, conn);
1486         }
1487
1488         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1489                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1490                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1491                         " error.\n", payload_length,
1492                         conn->conn_ops->MaxRecvDataSegmentLength);
1493                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1494                                         buf, conn);
1495         }
1496
1497         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1498                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1499                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1500                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1501                 payload_length);
1502         /*
1503          * This is not a response to a Unsolicited NopIN, which means
1504          * it can either be a NOPOUT ping request (with a valid ITT),
1505          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1506          * Either way, make sure we allocate an struct iscsi_cmd, as both
1507          * can contain ping data.
1508          */
1509         if (hdr->ttt == 0xFFFFFFFF) {
1510                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1511                 if (!cmd)
1512                         return iscsit_add_reject(
1513                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1514                                         1, buf, conn);
1515
1516                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1517                 cmd->i_state            = ISTATE_SEND_NOPIN;
1518                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1519                                                 1 : 0);
1520                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1521                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1522                 cmd->cmd_sn             = hdr->cmdsn;
1523                 cmd->exp_stat_sn        = hdr->exp_statsn;
1524                 cmd->data_direction     = DMA_NONE;
1525         }
1526
1527         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1528                 rx_size = payload_length;
1529                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1530                 if (!ping_data) {
1531                         pr_err("Unable to allocate memory for"
1532                                 " NOPOUT ping data.\n");
1533                         ret = -1;
1534                         goto out;
1535                 }
1536
1537                 iov = &cmd->iov_misc[0];
1538                 iov[niov].iov_base      = ping_data;
1539                 iov[niov++].iov_len     = payload_length;
1540
1541                 padding = ((-payload_length) & 3);
1542                 if (padding != 0) {
1543                         pr_debug("Receiving %u additional bytes"
1544                                 " for padding.\n", padding);
1545                         iov[niov].iov_base      = &cmd->pad_bytes;
1546                         iov[niov++].iov_len     = padding;
1547                         rx_size += padding;
1548                 }
1549                 if (conn->conn_ops->DataDigest) {
1550                         iov[niov].iov_base      = &checksum;
1551                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1552                         rx_size += ISCSI_CRC_LEN;
1553                 }
1554
1555                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1556                 if (rx_got != rx_size) {
1557                         ret = -1;
1558                         goto out;
1559                 }
1560
1561                 if (conn->conn_ops->DataDigest) {
1562                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1563                                         ping_data, payload_length,
1564                                         padding, cmd->pad_bytes,
1565                                         (u8 *)&data_crc);
1566
1567                         if (checksum != data_crc) {
1568                                 pr_err("Ping data CRC32C DataDigest"
1569                                 " 0x%08x does not match computed 0x%08x\n",
1570                                         checksum, data_crc);
1571                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1572                                         pr_err("Unable to recover from"
1573                                         " NOPOUT Ping DataCRC failure while in"
1574                                                 " ERL=0.\n");
1575                                         ret = -1;
1576                                         goto out;
1577                                 } else {
1578                                         /*
1579                                          * Silently drop this PDU and let the
1580                                          * initiator plug the CmdSN gap.
1581                                          */
1582                                         pr_debug("Dropping NOPOUT"
1583                                         " Command CmdSN: 0x%08x due to"
1584                                         " DataCRC error.\n", hdr->cmdsn);
1585                                         ret = 0;
1586                                         goto out;
1587                                 }
1588                         } else {
1589                                 pr_debug("Got CRC32C DataDigest"
1590                                 " 0x%08x for %u bytes of ping data.\n",
1591                                         checksum, payload_length);
1592                         }
1593                 }
1594
1595                 ping_data[payload_length] = '\0';
1596                 /*
1597                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1598                  */
1599                 cmd->buf_ptr = (void *)ping_data;
1600                 cmd->buf_ptr_size = payload_length;
1601
1602                 pr_debug("Got %u bytes of NOPOUT ping"
1603                         " data.\n", payload_length);
1604                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1605         }
1606
1607         if (hdr->itt != 0xFFFFFFFF) {
1608                 if (!cmd) {
1609                         pr_err("Checking CmdSN for NOPOUT,"
1610                                 " but cmd is NULL!\n");
1611                         return -1;
1612                 }
1613                 /*
1614                  * Initiator is expecting a NopIN ping reply,
1615                  */
1616                 spin_lock_bh(&conn->cmd_lock);
1617                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1618                 spin_unlock_bh(&conn->cmd_lock);
1619
1620                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1621
1622                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1623                         iscsit_add_cmd_to_response_queue(cmd, conn,
1624                                         cmd->i_state);
1625                         return 0;
1626                 }
1627
1628                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1629                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1630                         ret = 0;
1631                         goto ping_out;
1632                 }
1633                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1634                         return iscsit_add_reject_from_cmd(
1635                                         ISCSI_REASON_PROTOCOL_ERROR,
1636                                         1, 0, buf, cmd);
1637
1638                 return 0;
1639         }
1640
1641         if (hdr->ttt != 0xFFFFFFFF) {
1642                 /*
1643                  * This was a response to a unsolicited NOPIN ping.
1644                  */
1645                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1646                 if (!cmd)
1647                         return -1;
1648
1649                 iscsit_stop_nopin_response_timer(conn);
1650
1651                 cmd->i_state = ISTATE_REMOVE;
1652                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1653                 iscsit_start_nopin_timer(conn);
1654         } else {
1655                 /*
1656                  * Initiator is not expecting a NOPIN is response.
1657                  * Just ignore for now.
1658                  *
1659                  * iSCSI v19-91 10.18
1660                  * "A NOP-OUT may also be used to confirm a changed
1661                  *  ExpStatSN if another PDU will not be available
1662                  *  for a long time."
1663                  */
1664                 ret = 0;
1665                 goto out;
1666         }
1667
1668         return 0;
1669 out:
1670         if (cmd)
1671                 iscsit_release_cmd(cmd);
1672 ping_out:
1673         kfree(ping_data);
1674         return ret;
1675 }
1676
1677 static int iscsit_handle_task_mgt_cmd(
1678         struct iscsi_conn *conn,
1679         unsigned char *buf)
1680 {
1681         struct iscsi_cmd *cmd;
1682         struct se_tmr_req *se_tmr;
1683         struct iscsi_tmr_req *tmr_req;
1684         struct iscsi_tm *hdr;
1685         u32 payload_length;
1686         int out_of_order_cmdsn = 0;
1687         int ret;
1688         u8 function;
1689
1690         hdr                     = (struct iscsi_tm *) buf;
1691         payload_length          = ntoh24(hdr->dlength);
1692         hdr->itt                = be32_to_cpu(hdr->itt);
1693         hdr->rtt                = be32_to_cpu(hdr->rtt);
1694         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1695         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1696         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1697         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1698         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1699         function = hdr->flags;
1700
1701         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1702                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1703                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1704                 hdr->rtt, hdr->refcmdsn, conn->cid);
1705
1706         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1707             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1708              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1709                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1710                 hdr->rtt = ISCSI_RESERVED_TAG;
1711         }
1712
1713         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1714                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715                 pr_err("Task Management Request TASK_REASSIGN not"
1716                         " issued as immediate command, bad iSCSI Initiator"
1717                                 "implementation\n");
1718                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1719                                         buf, conn);
1720         }
1721         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1722             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1723                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1724
1725         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1726         if (!cmd)
1727                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1728                                         1, buf, conn);
1729
1730         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1731         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1732         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1733         cmd->init_task_tag      = hdr->itt;
1734         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1735         cmd->cmd_sn             = hdr->cmdsn;
1736         cmd->exp_stat_sn        = hdr->exp_statsn;
1737         se_tmr                  = cmd->se_cmd.se_tmr_req;
1738         tmr_req                 = cmd->tmr_req;
1739         /*
1740          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1741          */
1742         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1743                 ret = iscsit_get_lun_for_tmr(cmd,
1744                                 get_unaligned_le64(&hdr->lun));
1745                 if (ret < 0) {
1746                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1747                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1748                         goto attach;
1749                 }
1750         }
1751
1752         switch (function) {
1753         case ISCSI_TM_FUNC_ABORT_TASK:
1754                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1755                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1756                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1757                         goto attach;
1758                 }
1759                 break;
1760         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1761         case ISCSI_TM_FUNC_CLEAR_ACA:
1762         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1763         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1764                 break;
1765         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1766                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1767                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1768                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1769                         goto attach;
1770                 }
1771                 break;
1772         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1773                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1774                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1775                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1776                         goto attach;
1777                 }
1778                 break;
1779         case ISCSI_TM_FUNC_TASK_REASSIGN:
1780                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1781                 /*
1782                  * Perform sanity checks on the ExpDataSN only if the
1783                  * TASK_REASSIGN was successful.
1784                  */
1785                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1786                         break;
1787
1788                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1789                         return iscsit_add_reject_from_cmd(
1790                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1791                                         buf, cmd);
1792                 break;
1793         default:
1794                 pr_err("Unknown TMR function: 0x%02x, protocol"
1795                         " error.\n", function);
1796                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1797                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1798                 goto attach;
1799         }
1800
1801         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1802             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1803                 se_tmr->call_transport = 1;
1804 attach:
1805         spin_lock_bh(&conn->cmd_lock);
1806         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1807         spin_unlock_bh(&conn->cmd_lock);
1808
1809         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1810                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1811                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1812                         out_of_order_cmdsn = 1;
1813                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1814                         return 0;
1815                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1816                         return iscsit_add_reject_from_cmd(
1817                                         ISCSI_REASON_PROTOCOL_ERROR,
1818                                         1, 0, buf, cmd);
1819         }
1820         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1821
1822         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1823                 return 0;
1824         /*
1825          * Found the referenced task, send to transport for processing.
1826          */
1827         if (se_tmr->call_transport)
1828                 return transport_generic_handle_tmr(&cmd->se_cmd);
1829
1830         /*
1831          * Could not find the referenced LUN, task, or Task Management
1832          * command not authorized or supported.  Change state and
1833          * let the tx_thread send the response.
1834          *
1835          * For connection recovery, this is also the default action for
1836          * TMR TASK_REASSIGN.
1837          */
1838         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1839         return 0;
1840 }
1841
1842 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1843 static int iscsit_handle_text_cmd(
1844         struct iscsi_conn *conn,
1845         unsigned char *buf)
1846 {
1847         char *text_ptr, *text_in;
1848         int cmdsn_ret, niov = 0, rx_got, rx_size;
1849         u32 checksum = 0, data_crc = 0, payload_length;
1850         u32 padding = 0, pad_bytes = 0, text_length = 0;
1851         struct iscsi_cmd *cmd;
1852         struct kvec iov[3];
1853         struct iscsi_text *hdr;
1854
1855         hdr                     = (struct iscsi_text *) buf;
1856         payload_length          = ntoh24(hdr->dlength);
1857         hdr->itt                = be32_to_cpu(hdr->itt);
1858         hdr->ttt                = be32_to_cpu(hdr->ttt);
1859         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1860         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1861
1862         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1863                 pr_err("Unable to accept text parameter length: %u"
1864                         "greater than MaxRecvDataSegmentLength %u.\n",
1865                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1866                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1867                                         buf, conn);
1868         }
1869
1870         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1871                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1872                 hdr->exp_statsn, payload_length);
1873
1874         rx_size = text_length = payload_length;
1875         if (text_length) {
1876                 text_in = kzalloc(text_length, GFP_KERNEL);
1877                 if (!text_in) {
1878                         pr_err("Unable to allocate memory for"
1879                                 " incoming text parameters\n");
1880                         return -1;
1881                 }
1882
1883                 memset(iov, 0, 3 * sizeof(struct kvec));
1884                 iov[niov].iov_base      = text_in;
1885                 iov[niov++].iov_len     = text_length;
1886
1887                 padding = ((-payload_length) & 3);
1888                 if (padding != 0) {
1889                         iov[niov].iov_base = &pad_bytes;
1890                         iov[niov++].iov_len  = padding;
1891                         rx_size += padding;
1892                         pr_debug("Receiving %u additional bytes"
1893                                         " for padding.\n", padding);
1894                 }
1895                 if (conn->conn_ops->DataDigest) {
1896                         iov[niov].iov_base      = &checksum;
1897                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1898                         rx_size += ISCSI_CRC_LEN;
1899                 }
1900
1901                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1902                 if (rx_got != rx_size) {
1903                         kfree(text_in);
1904                         return -1;
1905                 }
1906
1907                 if (conn->conn_ops->DataDigest) {
1908                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1909                                         text_in, text_length,
1910                                         padding, (u8 *)&pad_bytes,
1911                                         (u8 *)&data_crc);
1912
1913                         if (checksum != data_crc) {
1914                                 pr_err("Text data CRC32C DataDigest"
1915                                         " 0x%08x does not match computed"
1916                                         " 0x%08x\n", checksum, data_crc);
1917                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1918                                         pr_err("Unable to recover from"
1919                                         " Text Data digest failure while in"
1920                                                 " ERL=0.\n");
1921                                         kfree(text_in);
1922                                         return -1;
1923                                 } else {
1924                                         /*
1925                                          * Silently drop this PDU and let the
1926                                          * initiator plug the CmdSN gap.
1927                                          */
1928                                         pr_debug("Dropping Text"
1929                                         " Command CmdSN: 0x%08x due to"
1930                                         " DataCRC error.\n", hdr->cmdsn);
1931                                         kfree(text_in);
1932                                         return 0;
1933                                 }
1934                         } else {
1935                                 pr_debug("Got CRC32C DataDigest"
1936                                         " 0x%08x for %u bytes of text data.\n",
1937                                                 checksum, text_length);
1938                         }
1939                 }
1940                 text_in[text_length - 1] = '\0';
1941                 pr_debug("Successfully read %d bytes of text"
1942                                 " data.\n", text_length);
1943
1944                 if (strncmp("SendTargets", text_in, 11) != 0) {
1945                         pr_err("Received Text Data that is not"
1946                                 " SendTargets, cannot continue.\n");
1947                         kfree(text_in);
1948                         return -1;
1949                 }
1950                 text_ptr = strchr(text_in, '=');
1951                 if (!text_ptr) {
1952                         pr_err("No \"=\" separator found in Text Data,"
1953                                 "  cannot continue.\n");
1954                         kfree(text_in);
1955                         return -1;
1956                 }
1957                 if (strncmp("=All", text_ptr, 4) != 0) {
1958                         pr_err("Unable to locate All value for"
1959                                 " SendTargets key,  cannot continue.\n");
1960                         kfree(text_in);
1961                         return -1;
1962                 }
1963 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1964                 kfree(text_in);
1965         }
1966
1967         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1968         if (!cmd)
1969                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1970                                         1, buf, conn);
1971
1972         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1973         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1974         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1975         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1976         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1977         cmd->cmd_sn             = hdr->cmdsn;
1978         cmd->exp_stat_sn        = hdr->exp_statsn;
1979         cmd->data_direction     = DMA_NONE;
1980
1981         spin_lock_bh(&conn->cmd_lock);
1982         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1983         spin_unlock_bh(&conn->cmd_lock);
1984
1985         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1986
1987         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1988                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1989                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1990                         return iscsit_add_reject_from_cmd(
1991                                         ISCSI_REASON_PROTOCOL_ERROR,
1992                                         1, 0, buf, cmd);
1993
1994                 return 0;
1995         }
1996
1997         return iscsit_execute_cmd(cmd, 0);
1998 }
1999
2000 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2001 {
2002         struct iscsi_conn *conn_p;
2003         struct iscsi_session *sess = conn->sess;
2004
2005         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2006                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2007
2008         atomic_set(&sess->session_logout, 1);
2009         atomic_set(&conn->conn_logout_remove, 1);
2010         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2011
2012         iscsit_inc_conn_usage_count(conn);
2013         iscsit_inc_session_usage_count(sess);
2014
2015         spin_lock_bh(&sess->conn_lock);
2016         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2017                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2018                         continue;
2019
2020                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2021                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2022         }
2023         spin_unlock_bh(&sess->conn_lock);
2024
2025         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2026
2027         return 0;
2028 }
2029
2030 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2031 {
2032         struct iscsi_conn *l_conn;
2033         struct iscsi_session *sess = conn->sess;
2034
2035         pr_debug("Received logout request CLOSECONNECTION for CID:"
2036                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2037
2038         /*
2039          * A Logout Request with a CLOSECONNECTION reason code for a CID
2040          * can arrive on a connection with a differing CID.
2041          */
2042         if (conn->cid == cmd->logout_cid) {
2043                 spin_lock_bh(&conn->state_lock);
2044                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2045                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2046
2047                 atomic_set(&conn->conn_logout_remove, 1);
2048                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2049                 iscsit_inc_conn_usage_count(conn);
2050
2051                 spin_unlock_bh(&conn->state_lock);
2052         } else {
2053                 /*
2054                  * Handle all different cid CLOSECONNECTION requests in
2055                  * iscsit_logout_post_handler_diffcid() as to give enough
2056                  * time for any non immediate command's CmdSN to be
2057                  * acknowledged on the connection in question.
2058                  *
2059                  * Here we simply make sure the CID is still around.
2060                  */
2061                 l_conn = iscsit_get_conn_from_cid(sess,
2062                                 cmd->logout_cid);
2063                 if (!l_conn) {
2064                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2065                         iscsit_add_cmd_to_response_queue(cmd, conn,
2066                                         cmd->i_state);
2067                         return 0;
2068                 }
2069
2070                 iscsit_dec_conn_usage_count(l_conn);
2071         }
2072
2073         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2074
2075         return 0;
2076 }
2077
2078 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2079 {
2080         struct iscsi_session *sess = conn->sess;
2081
2082         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2083                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2084
2085         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2086                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2087                         " while ERL!=2.\n");
2088                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2089                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2090                 return 0;
2091         }
2092
2093         if (conn->cid == cmd->logout_cid) {
2094                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2095                         " with CID: %hu on CID: %hu, implementation error.\n",
2096                                 cmd->logout_cid, conn->cid);
2097                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2098                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2099                 return 0;
2100         }
2101
2102         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2103
2104         return 0;
2105 }
2106
2107 static int iscsit_handle_logout_cmd(
2108         struct iscsi_conn *conn,
2109         unsigned char *buf)
2110 {
2111         int cmdsn_ret, logout_remove = 0;
2112         u8 reason_code = 0;
2113         struct iscsi_cmd *cmd;
2114         struct iscsi_logout *hdr;
2115         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2116
2117         hdr                     = (struct iscsi_logout *) buf;
2118         reason_code             = (hdr->flags & 0x7f);
2119         hdr->itt                = be32_to_cpu(hdr->itt);
2120         hdr->cid                = be16_to_cpu(hdr->cid);
2121         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2122         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2123
2124         if (tiqn) {
2125                 spin_lock(&tiqn->logout_stats.lock);
2126                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2127                         tiqn->logout_stats.normal_logouts++;
2128                 else
2129                         tiqn->logout_stats.abnormal_logouts++;
2130                 spin_unlock(&tiqn->logout_stats.lock);
2131         }
2132
2133         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2134                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2135                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2136                 hdr->cid, conn->cid);
2137
2138         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2139                 pr_err("Received logout request on connection that"
2140                         " is not in logged in state, ignoring request.\n");
2141                 return 0;
2142         }
2143
2144         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2145         if (!cmd)
2146                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2147                                         buf, conn);
2148
2149         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2150         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2151         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2152         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2153         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2154         cmd->cmd_sn             = hdr->cmdsn;
2155         cmd->exp_stat_sn        = hdr->exp_statsn;
2156         cmd->logout_cid         = hdr->cid;
2157         cmd->logout_reason      = reason_code;
2158         cmd->data_direction     = DMA_NONE;
2159
2160         /*
2161          * We need to sleep in these cases (by returning 1) until the Logout
2162          * Response gets sent in the tx thread.
2163          */
2164         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2165            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2166             (hdr->cid == conn->cid)))
2167                 logout_remove = 1;
2168
2169         spin_lock_bh(&conn->cmd_lock);
2170         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2171         spin_unlock_bh(&conn->cmd_lock);
2172
2173         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2174                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2175
2176         /*
2177          * Immediate commands are executed, well, immediately.
2178          * Non-Immediate Logout Commands are executed in CmdSN order.
2179          */
2180         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2181                 int ret = iscsit_execute_cmd(cmd, 0);
2182
2183                 if (ret < 0)
2184                         return ret;
2185         } else {
2186                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2187                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2188                         logout_remove = 0;
2189                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2190                         return iscsit_add_reject_from_cmd(
2191                                 ISCSI_REASON_PROTOCOL_ERROR,
2192                                 1, 0, buf, cmd);
2193                 }
2194         }
2195
2196         return logout_remove;
2197 }
2198
2199 static int iscsit_handle_snack(
2200         struct iscsi_conn *conn,
2201         unsigned char *buf)
2202 {
2203         u32 unpacked_lun;
2204         u64 lun;
2205         struct iscsi_snack *hdr;
2206
2207         hdr                     = (struct iscsi_snack *) buf;
2208         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2209         lun                     = get_unaligned_le64(&hdr->lun);
2210         unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
2211         hdr->itt                = be32_to_cpu(hdr->itt);
2212         hdr->ttt                = be32_to_cpu(hdr->ttt);
2213         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2214         hdr->begrun             = be32_to_cpu(hdr->begrun);
2215         hdr->runlength          = be32_to_cpu(hdr->runlength);
2216
2217         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2218                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2219                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2220                         hdr->begrun, hdr->runlength, conn->cid);
2221
2222         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2223                 pr_err("Initiator sent SNACK request while in"
2224                         " ErrorRecoveryLevel=0.\n");
2225                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2226                                         buf, conn);
2227         }
2228         /*
2229          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2230          * call from inside iscsi_send_recovery_datain_or_r2t().
2231          */
2232         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2233         case 0:
2234                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2235                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2236         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2237                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2238                         hdr->begrun, hdr->runlength);
2239         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2240                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2241                         hdr->runlength);
2242         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2243                 /* FIXME: Support R-Data SNACK */
2244                 pr_err("R-Data SNACK Not Supported.\n");
2245                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2246                                         buf, conn);
2247         default:
2248                 pr_err("Unknown SNACK type 0x%02x, protocol"
2249                         " error.\n", hdr->flags & 0x0f);
2250                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2251                                         buf, conn);
2252         }
2253
2254         return 0;
2255 }
2256
2257 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2258 {
2259         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2260             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2261                 wait_for_completion_interruptible_timeout(
2262                                         &conn->rx_half_close_comp,
2263                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2264         }
2265 }
2266
2267 static int iscsit_handle_immediate_data(
2268         struct iscsi_cmd *cmd,
2269         unsigned char *buf,
2270         u32 length)
2271 {
2272         int iov_ret, rx_got = 0, rx_size = 0;
2273         u32 checksum, iov_count = 0, padding = 0;
2274         struct iscsi_conn *conn = cmd->conn;
2275         struct kvec *iov;
2276
2277         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2278         if (iov_ret < 0)
2279                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2280
2281         rx_size = length;
2282         iov_count = iov_ret;
2283         iov = &cmd->iov_data[0];
2284
2285         padding = ((-length) & 3);
2286         if (padding != 0) {
2287                 iov[iov_count].iov_base = cmd->pad_bytes;
2288                 iov[iov_count++].iov_len = padding;
2289                 rx_size += padding;
2290         }
2291
2292         if (conn->conn_ops->DataDigest) {
2293                 iov[iov_count].iov_base         = &checksum;
2294                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2295                 rx_size += ISCSI_CRC_LEN;
2296         }
2297
2298         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2299
2300         iscsit_unmap_iovec(cmd);
2301
2302         if (rx_got != rx_size) {
2303                 iscsit_rx_thread_wait_for_tcp(conn);
2304                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2305         }
2306
2307         if (conn->conn_ops->DataDigest) {
2308                 u32 data_crc;
2309
2310                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2311                                                     cmd->write_data_done, length, padding,
2312                                                     cmd->pad_bytes);
2313
2314                 if (checksum != data_crc) {
2315                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2316                                 " does not match computed 0x%08x\n", checksum,
2317                                 data_crc);
2318
2319                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2320                                 pr_err("Unable to recover from"
2321                                         " Immediate Data digest failure while"
2322                                         " in ERL=0.\n");
2323                                 iscsit_add_reject_from_cmd(
2324                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2325                                                 1, 0, buf, cmd);
2326                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2327                         } else {
2328                                 iscsit_add_reject_from_cmd(
2329                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2330                                                 0, 0, buf, cmd);
2331                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2332                         }
2333                 } else {
2334                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2335                                 " %u bytes of Immediate Data\n", checksum,
2336                                 length);
2337                 }
2338         }
2339
2340         cmd->write_data_done += length;
2341
2342         if (cmd->write_data_done == cmd->data_length) {
2343                 spin_lock_bh(&cmd->istate_lock);
2344                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2345                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2346                 spin_unlock_bh(&cmd->istate_lock);
2347         }
2348
2349         return IMMEDIATE_DATA_NORMAL_OPERATION;
2350 }
2351
2352 /*
2353  *      Called with sess->conn_lock held.
2354  */
2355 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2356         with active network interface */
2357 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2358 {
2359         struct iscsi_cmd *cmd;
2360         struct iscsi_conn *conn_p;
2361         bool found = false;
2362
2363         /*
2364          * Only send a Asynchronous Message on connections whos network
2365          * interface is still functional.
2366          */
2367         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2368                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2369                         iscsit_inc_conn_usage_count(conn_p);
2370                         found = true;
2371                         break;
2372                 }
2373         }
2374
2375         if (!found)
2376                 return;
2377
2378         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2379         if (!cmd) {
2380                 iscsit_dec_conn_usage_count(conn_p);
2381                 return;
2382         }
2383
2384         cmd->logout_cid = conn->cid;
2385         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2386         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2387
2388         spin_lock_bh(&conn_p->cmd_lock);
2389         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2390         spin_unlock_bh(&conn_p->cmd_lock);
2391
2392         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2393         iscsit_dec_conn_usage_count(conn_p);
2394 }
2395
2396 static int iscsit_send_conn_drop_async_message(
2397         struct iscsi_cmd *cmd,
2398         struct iscsi_conn *conn)
2399 {
2400         struct iscsi_async *hdr;
2401
2402         cmd->tx_size = ISCSI_HDR_LEN;
2403         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2404
2405         hdr                     = (struct iscsi_async *) cmd->pdu;
2406         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2407         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2408         cmd->init_task_tag      = 0xFFFFFFFF;
2409         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2410         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2411         cmd->stat_sn            = conn->stat_sn++;
2412         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2413         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2414         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2415         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2416         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2417         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2418         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2419
2420         if (conn->conn_ops->HeaderDigest) {
2421                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2422
2423                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2424                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2425                                 0, NULL, (u8 *)header_digest);
2426
2427                 cmd->tx_size += ISCSI_CRC_LEN;
2428                 pr_debug("Attaching CRC32C HeaderDigest to"
2429                         " Async Message 0x%08x\n", *header_digest);
2430         }
2431
2432         cmd->iov_misc[0].iov_base       = cmd->pdu;
2433         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2434         cmd->iov_misc_count             = 1;
2435
2436         pr_debug("Sending Connection Dropped Async Message StatSN:"
2437                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2438                         cmd->logout_cid, conn->cid);
2439         return 0;
2440 }
2441
2442 static int iscsit_send_data_in(
2443         struct iscsi_cmd *cmd,
2444         struct iscsi_conn *conn,
2445         int *eodr)
2446 {
2447         int iov_ret = 0, set_statsn = 0;
2448         u32 iov_count = 0, tx_size = 0;
2449         struct iscsi_datain datain;
2450         struct iscsi_datain_req *dr;
2451         struct iscsi_data_rsp *hdr;
2452         struct kvec *iov;
2453
2454         memset(&datain, 0, sizeof(struct iscsi_datain));
2455         dr = iscsit_get_datain_values(cmd, &datain);
2456         if (!dr) {
2457                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2458                                 cmd->init_task_tag);
2459                 return -1;
2460         }
2461
2462         /*
2463          * Be paranoid and double check the logic for now.
2464          */
2465         if ((datain.offset + datain.length) > cmd->data_length) {
2466                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2467                         " datain.length: %u exceeds cmd->data_length: %u\n",
2468                         cmd->init_task_tag, datain.offset, datain.length,
2469                                 cmd->data_length);
2470                 return -1;
2471         }
2472
2473         spin_lock_bh(&conn->sess->session_stats_lock);
2474         conn->sess->tx_data_octets += datain.length;
2475         if (conn->sess->se_sess->se_node_acl) {
2476                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2477                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2478                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2479         }
2480         spin_unlock_bh(&conn->sess->session_stats_lock);
2481         /*
2482          * Special case for successfully execution w/ both DATAIN
2483          * and Sense Data.
2484          */
2485         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2486             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2487                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2488         else {
2489                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2490                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2491                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2492                         cmd->stat_sn = conn->stat_sn++;
2493                         set_statsn = 1;
2494                 } else if (dr->dr_complete ==
2495                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2496                         set_statsn = 1;
2497         }
2498
2499         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2500         memset(hdr, 0, ISCSI_HDR_LEN);
2501         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2502         hdr->flags              = datain.flags;
2503         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2504                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2505                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2506                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2507                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2508                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2509                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2510                 }
2511         }
2512         hton24(hdr->dlength, datain.length);
2513         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2514                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2515                                 (struct scsi_lun *)&hdr->lun);
2516         else
2517                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2518
2519         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2520         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2521                                    cpu_to_be32(cmd->targ_xfer_tag) :
2522                                    0xFFFFFFFF;
2523         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2524                                                 0xFFFFFFFF;
2525         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2526         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2527         hdr->datasn             = cpu_to_be32(datain.data_sn);
2528         hdr->offset             = cpu_to_be32(datain.offset);
2529
2530         iov = &cmd->iov_data[0];
2531         iov[iov_count].iov_base = cmd->pdu;
2532         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2533         tx_size += ISCSI_HDR_LEN;
2534
2535         if (conn->conn_ops->HeaderDigest) {
2536                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2537
2538                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2539                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2540                                 0, NULL, (u8 *)header_digest);
2541
2542                 iov[0].iov_len += ISCSI_CRC_LEN;
2543                 tx_size += ISCSI_CRC_LEN;
2544
2545                 pr_debug("Attaching CRC32 HeaderDigest"
2546                         " for DataIN PDU 0x%08x\n", *header_digest);
2547         }
2548
2549         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2550         if (iov_ret < 0)
2551                 return -1;
2552
2553         iov_count += iov_ret;
2554         tx_size += datain.length;
2555
2556         cmd->padding = ((-datain.length) & 3);
2557         if (cmd->padding) {
2558                 iov[iov_count].iov_base         = cmd->pad_bytes;
2559                 iov[iov_count++].iov_len        = cmd->padding;
2560                 tx_size += cmd->padding;
2561
2562                 pr_debug("Attaching %u padding bytes\n",
2563                                 cmd->padding);
2564         }
2565         if (conn->conn_ops->DataDigest) {
2566                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2567                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2568
2569                 iov[iov_count].iov_base = &cmd->data_crc;
2570                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2571                 tx_size += ISCSI_CRC_LEN;
2572
2573                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2574                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2575         }
2576
2577         cmd->iov_data_count = iov_count;
2578         cmd->tx_size = tx_size;
2579
2580         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2581                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2582                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2583                 ntohl(hdr->offset), datain.length, conn->cid);
2584
2585         if (dr->dr_complete) {
2586                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2587                                 2 : 1;
2588                 iscsit_free_datain_req(cmd, dr);
2589         }
2590
2591         return 0;
2592 }
2593
2594 static int iscsit_send_logout_response(
2595         struct iscsi_cmd *cmd,
2596         struct iscsi_conn *conn)
2597 {
2598         int niov = 0, tx_size;
2599         struct iscsi_conn *logout_conn = NULL;
2600         struct iscsi_conn_recovery *cr = NULL;
2601         struct iscsi_session *sess = conn->sess;
2602         struct kvec *iov;
2603         struct iscsi_logout_rsp *hdr;
2604         /*
2605          * The actual shutting down of Sessions and/or Connections
2606          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2607          * is done in scsi_logout_post_handler().
2608          */
2609         switch (cmd->logout_reason) {
2610         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2611                 pr_debug("iSCSI session logout successful, setting"
2612                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2613                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2614                 break;
2615         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2616                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2617                         break;
2618                 /*
2619                  * For CLOSECONNECTION logout requests carrying
2620                  * a matching logout CID -> local CID, the reference
2621                  * for the local CID will have been incremented in
2622                  * iscsi_logout_closeconnection().
2623                  *
2624                  * For CLOSECONNECTION logout requests carrying
2625                  * a different CID than the connection it arrived
2626                  * on, the connection responding to cmd->logout_cid
2627                  * is stopped in iscsit_logout_post_handler_diffcid().
2628                  */
2629
2630                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2631                         " successful.\n", cmd->logout_cid, conn->cid);
2632                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2633                 break;
2634         case ISCSI_LOGOUT_REASON_RECOVERY:
2635                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2636                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2637                         break;
2638                 /*
2639                  * If the connection is still active from our point of view
2640                  * force connection recovery to occur.
2641                  */
2642                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2643                                 cmd->logout_cid);
2644                 if ((logout_conn)) {
2645                         iscsit_connection_reinstatement_rcfr(logout_conn);
2646                         iscsit_dec_conn_usage_count(logout_conn);
2647                 }
2648
2649                 cr = iscsit_get_inactive_connection_recovery_entry(
2650                                 conn->sess, cmd->logout_cid);
2651                 if (!cr) {
2652                         pr_err("Unable to locate CID: %hu for"
2653                         " REMOVECONNFORRECOVERY Logout Request.\n",
2654                                 cmd->logout_cid);
2655                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2656                         break;
2657                 }
2658
2659                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2660
2661                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2662                         " for recovery for CID: %hu on CID: %hu successful.\n",
2663                                 cmd->logout_cid, conn->cid);
2664                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2665                 break;
2666         default:
2667                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2668                                 cmd->logout_reason);
2669                 return -1;
2670         }
2671
2672         tx_size = ISCSI_HDR_LEN;
2673         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2674         memset(hdr, 0, ISCSI_HDR_LEN);
2675         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2676         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2677         hdr->response           = cmd->logout_response;
2678         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2679         cmd->stat_sn            = conn->stat_sn++;
2680         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2681
2682         iscsit_increment_maxcmdsn(cmd, conn->sess);
2683         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2684         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2685
2686         iov = &cmd->iov_misc[0];
2687         iov[niov].iov_base      = cmd->pdu;
2688         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2689
2690         if (conn->conn_ops->HeaderDigest) {
2691                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2692
2693                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2694                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2695                                 0, NULL, (u8 *)header_digest);
2696
2697                 iov[0].iov_len += ISCSI_CRC_LEN;
2698                 tx_size += ISCSI_CRC_LEN;
2699                 pr_debug("Attaching CRC32C HeaderDigest to"
2700                         " Logout Response 0x%08x\n", *header_digest);
2701         }
2702         cmd->iov_misc_count = niov;
2703         cmd->tx_size = tx_size;
2704
2705         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2706                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2707                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2708                 cmd->logout_cid, conn->cid);
2709
2710         return 0;
2711 }
2712
2713 /*
2714  *      Unsolicited NOPIN, either requesting a response or not.
2715  */
2716 static int iscsit_send_unsolicited_nopin(
2717         struct iscsi_cmd *cmd,
2718         struct iscsi_conn *conn,
2719         int want_response)
2720 {
2721         int tx_size = ISCSI_HDR_LEN;
2722         struct iscsi_nopin *hdr;
2723
2724         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2725         memset(hdr, 0, ISCSI_HDR_LEN);
2726         hdr->opcode             = ISCSI_OP_NOOP_IN;
2727         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2728         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2729         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2730         cmd->stat_sn            = conn->stat_sn;
2731         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2732         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2733         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2734
2735         if (conn->conn_ops->HeaderDigest) {
2736                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2737
2738                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2739                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2740                                 0, NULL, (u8 *)header_digest);
2741
2742                 tx_size += ISCSI_CRC_LEN;
2743                 pr_debug("Attaching CRC32C HeaderDigest to"
2744                         " NopIN 0x%08x\n", *header_digest);
2745         }
2746
2747         cmd->iov_misc[0].iov_base       = cmd->pdu;
2748         cmd->iov_misc[0].iov_len        = tx_size;
2749         cmd->iov_misc_count     = 1;
2750         cmd->tx_size            = tx_size;
2751
2752         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2753                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2754
2755         return 0;
2756 }
2757
2758 static int iscsit_send_nopin_response(
2759         struct iscsi_cmd *cmd,
2760         struct iscsi_conn *conn)
2761 {
2762         int niov = 0, tx_size;
2763         u32 padding = 0;
2764         struct kvec *iov;
2765         struct iscsi_nopin *hdr;
2766
2767         tx_size = ISCSI_HDR_LEN;
2768         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2769         memset(hdr, 0, ISCSI_HDR_LEN);
2770         hdr->opcode             = ISCSI_OP_NOOP_IN;
2771         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2772         hton24(hdr->dlength, cmd->buf_ptr_size);
2773         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2774         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2775         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2776         cmd->stat_sn            = conn->stat_sn++;
2777         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2778
2779         iscsit_increment_maxcmdsn(cmd, conn->sess);
2780         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2781         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2782
2783         iov = &cmd->iov_misc[0];
2784         iov[niov].iov_base      = cmd->pdu;
2785         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2786
2787         if (conn->conn_ops->HeaderDigest) {
2788                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2789
2790                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2791                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2792                                 0, NULL, (u8 *)header_digest);
2793
2794                 iov[0].iov_len += ISCSI_CRC_LEN;
2795                 tx_size += ISCSI_CRC_LEN;
2796                 pr_debug("Attaching CRC32C HeaderDigest"
2797                         " to NopIn 0x%08x\n", *header_digest);
2798         }
2799
2800         /*
2801          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2802          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2803          */
2804         if (cmd->buf_ptr_size) {
2805                 iov[niov].iov_base      = cmd->buf_ptr;
2806                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2807                 tx_size += cmd->buf_ptr_size;
2808
2809                 pr_debug("Echoing back %u bytes of ping"
2810                         " data.\n", cmd->buf_ptr_size);
2811
2812                 padding = ((-cmd->buf_ptr_size) & 3);
2813                 if (padding != 0) {
2814                         iov[niov].iov_base = &cmd->pad_bytes;
2815                         iov[niov++].iov_len = padding;
2816                         tx_size += padding;
2817                         pr_debug("Attaching %u additional"
2818                                 " padding bytes.\n", padding);
2819                 }
2820                 if (conn->conn_ops->DataDigest) {
2821                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2822                                 cmd->buf_ptr, cmd->buf_ptr_size,
2823                                 padding, (u8 *)&cmd->pad_bytes,
2824                                 (u8 *)&cmd->data_crc);
2825
2826                         iov[niov].iov_base = &cmd->data_crc;
2827                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2828                         tx_size += ISCSI_CRC_LEN;
2829                         pr_debug("Attached DataDigest for %u"
2830                                 " bytes of ping data, CRC 0x%08x\n",
2831                                 cmd->buf_ptr_size, cmd->data_crc);
2832                 }
2833         }
2834
2835         cmd->iov_misc_count = niov;
2836         cmd->tx_size = tx_size;
2837
2838         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2839                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2840                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2841
2842         return 0;
2843 }
2844
2845 int iscsit_send_r2t(
2846         struct iscsi_cmd *cmd,
2847         struct iscsi_conn *conn)
2848 {
2849         int tx_size = 0;
2850         struct iscsi_r2t *r2t;
2851         struct iscsi_r2t_rsp *hdr;
2852
2853         r2t = iscsit_get_r2t_from_list(cmd);
2854         if (!r2t)
2855                 return -1;
2856
2857         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2858         memset(hdr, 0, ISCSI_HDR_LEN);
2859         hdr->opcode             = ISCSI_OP_R2T;
2860         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2861         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2862                         (struct scsi_lun *)&hdr->lun);
2863         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2864         spin_lock_bh(&conn->sess->ttt_lock);
2865         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2866         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2867                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2868         spin_unlock_bh(&conn->sess->ttt_lock);
2869         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2870         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2871         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2872         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2873         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2874         hdr->data_offset        = cpu_to_be32(r2t->offset);
2875         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2876
2877         cmd->iov_misc[0].iov_base       = cmd->pdu;
2878         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2879         tx_size += ISCSI_HDR_LEN;
2880
2881         if (conn->conn_ops->HeaderDigest) {
2882                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2883
2884                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2885                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2886                                 0, NULL, (u8 *)header_digest);
2887
2888                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2889                 tx_size += ISCSI_CRC_LEN;
2890                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2891                         " PDU 0x%08x\n", *header_digest);
2892         }
2893
2894         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2895                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2896                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2897                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2898                         r2t->offset, r2t->xfer_len, conn->cid);
2899
2900         cmd->iov_misc_count = 1;
2901         cmd->tx_size = tx_size;
2902
2903         spin_lock_bh(&cmd->r2t_lock);
2904         r2t->sent_r2t = 1;
2905         spin_unlock_bh(&cmd->r2t_lock);
2906
2907         return 0;
2908 }
2909
2910 /*
2911  *      type 0: Normal Operation.
2912  *      type 1: Called from Storage Transport.
2913  *      type 2: Called from iscsi_task_reassign_complete_write() for
2914  *              connection recovery.
2915  */
2916 int iscsit_build_r2ts_for_cmd(
2917         struct iscsi_cmd *cmd,
2918         struct iscsi_conn *conn,
2919         int type)
2920 {
2921         int first_r2t = 1;
2922         u32 offset = 0, xfer_len = 0;
2923
2924         spin_lock_bh(&cmd->r2t_lock);
2925         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2926                 spin_unlock_bh(&cmd->r2t_lock);
2927                 return 0;
2928         }
2929
2930         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2931                 if (cmd->r2t_offset < cmd->write_data_done)
2932                         cmd->r2t_offset = cmd->write_data_done;
2933
2934         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2935                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2936                         offset = cmd->r2t_offset;
2937
2938                         if (first_r2t && (type == 2)) {
2939                                 xfer_len = ((offset +
2940                                              (conn->sess->sess_ops->MaxBurstLength -
2941                                              cmd->next_burst_len) >
2942                                              cmd->data_length) ?
2943                                             (cmd->data_length - offset) :
2944                                             (conn->sess->sess_ops->MaxBurstLength -
2945                                              cmd->next_burst_len));
2946                         } else {
2947                                 xfer_len = ((offset +
2948                                              conn->sess->sess_ops->MaxBurstLength) >
2949                                              cmd->data_length) ?
2950                                              (cmd->data_length - offset) :
2951                                              conn->sess->sess_ops->MaxBurstLength;
2952                         }
2953                         cmd->r2t_offset += xfer_len;
2954
2955                         if (cmd->r2t_offset == cmd->data_length)
2956                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2957                 } else {
2958                         struct iscsi_seq *seq;
2959
2960                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2961                         if (!seq) {
2962                                 spin_unlock_bh(&cmd->r2t_lock);
2963                                 return -1;
2964                         }
2965
2966                         offset = seq->offset;
2967                         xfer_len = seq->xfer_len;
2968
2969                         if (cmd->seq_send_order == cmd->seq_count)
2970                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2971                 }
2972                 cmd->outstanding_r2ts++;
2973                 first_r2t = 0;
2974
2975                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2976                         spin_unlock_bh(&cmd->r2t_lock);
2977                         return -1;
2978                 }
2979
2980                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2981                         break;
2982         }
2983         spin_unlock_bh(&cmd->r2t_lock);
2984
2985         return 0;
2986 }
2987
2988 static int iscsit_send_status(
2989         struct iscsi_cmd *cmd,
2990         struct iscsi_conn *conn)
2991 {
2992         u8 iov_count = 0, recovery;
2993         u32 padding = 0, tx_size = 0;
2994         struct iscsi_scsi_rsp *hdr;
2995         struct kvec *iov;
2996
2997         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
2998         if (!recovery)
2999                 cmd->stat_sn = conn->stat_sn++;
3000
3001         spin_lock_bh(&conn->sess->session_stats_lock);
3002         conn->sess->rsp_pdus++;
3003         spin_unlock_bh(&conn->sess->session_stats_lock);
3004
3005         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3006         memset(hdr, 0, ISCSI_HDR_LEN);
3007         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3008         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3009         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3010                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3011                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3012         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3013                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3014                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3015         }
3016         hdr->response           = cmd->iscsi_response;
3017         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3018         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3019         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3020
3021         iscsit_increment_maxcmdsn(cmd, conn->sess);
3022         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3023         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3024
3025         iov = &cmd->iov_misc[0];
3026         iov[iov_count].iov_base = cmd->pdu;
3027         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3028         tx_size += ISCSI_HDR_LEN;
3029
3030         /*
3031          * Attach SENSE DATA payload to iSCSI Response PDU
3032          */
3033         if (cmd->se_cmd.sense_buffer &&
3034            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3035             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3036                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3037                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3038                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3039                 iov[iov_count++].iov_len =
3040                                 (cmd->se_cmd.scsi_sense_length + padding);
3041                 tx_size += cmd->se_cmd.scsi_sense_length;
3042
3043                 if (padding) {
3044                         memset(cmd->se_cmd.sense_buffer +
3045                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3046                         tx_size += padding;
3047                         pr_debug("Adding %u bytes of padding to"
3048                                 " SENSE.\n", padding);
3049                 }
3050
3051                 if (conn->conn_ops->DataDigest) {
3052                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3053                                 cmd->se_cmd.sense_buffer,
3054                                 (cmd->se_cmd.scsi_sense_length + padding),
3055                                 0, NULL, (u8 *)&cmd->data_crc);
3056
3057                         iov[iov_count].iov_base    = &cmd->data_crc;
3058                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3059                         tx_size += ISCSI_CRC_LEN;
3060
3061                         pr_debug("Attaching CRC32 DataDigest for"
3062                                 " SENSE, %u bytes CRC 0x%08x\n",
3063                                 (cmd->se_cmd.scsi_sense_length + padding),
3064                                 cmd->data_crc);
3065                 }
3066
3067                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3068                                 " Response PDU\n",
3069                                 cmd->se_cmd.scsi_sense_length);
3070         }
3071
3072         if (conn->conn_ops->HeaderDigest) {
3073                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3074
3075                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3076                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3077                                 0, NULL, (u8 *)header_digest);
3078
3079                 iov[0].iov_len += ISCSI_CRC_LEN;
3080                 tx_size += ISCSI_CRC_LEN;
3081                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3082                                 " PDU 0x%08x\n", *header_digest);
3083         }
3084
3085         cmd->iov_misc_count = iov_count;
3086         cmd->tx_size = tx_size;
3087
3088         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3089                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3090                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3091                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3092
3093         return 0;
3094 }
3095
3096 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3097 {
3098         switch (se_tmr->response) {
3099         case TMR_FUNCTION_COMPLETE:
3100                 return ISCSI_TMF_RSP_COMPLETE;
3101         case TMR_TASK_DOES_NOT_EXIST:
3102                 return ISCSI_TMF_RSP_NO_TASK;
3103         case TMR_LUN_DOES_NOT_EXIST:
3104                 return ISCSI_TMF_RSP_NO_LUN;
3105         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3106                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3107         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3108                 return ISCSI_TMF_RSP_AUTH_FAILED;
3109         case TMR_FUNCTION_REJECTED:
3110         default:
3111                 return ISCSI_TMF_RSP_REJECTED;
3112         }
3113 }
3114
3115 static int iscsit_send_task_mgt_rsp(
3116         struct iscsi_cmd *cmd,
3117         struct iscsi_conn *conn)
3118 {
3119         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3120         struct iscsi_tm_rsp *hdr;
3121         u32 tx_size = 0;
3122
3123         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3124         memset(hdr, 0, ISCSI_HDR_LEN);
3125         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3126         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3127         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3128         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3129         cmd->stat_sn            = conn->stat_sn++;
3130         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3131
3132         iscsit_increment_maxcmdsn(cmd, conn->sess);
3133         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3134         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3135
3136         cmd->iov_misc[0].iov_base       = cmd->pdu;
3137         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3138         tx_size += ISCSI_HDR_LEN;
3139
3140         if (conn->conn_ops->HeaderDigest) {
3141                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3142
3143                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3144                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3145                                 0, NULL, (u8 *)header_digest);
3146
3147                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3148                 tx_size += ISCSI_CRC_LEN;
3149                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3150                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3151         }
3152
3153         cmd->iov_misc_count = 1;
3154         cmd->tx_size = tx_size;
3155
3156         pr_debug("Built Task Management Response ITT: 0x%08x,"
3157                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3158                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3159
3160         return 0;
3161 }
3162
3163 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3164 {
3165         bool ret = false;
3166
3167         if (np->np_sockaddr.ss_family == AF_INET6) {
3168                 const struct sockaddr_in6 sin6 = {
3169                         .sin6_addr = IN6ADDR_ANY_INIT };
3170                 struct sockaddr_in6 *sock_in6 =
3171                          (struct sockaddr_in6 *)&np->np_sockaddr;
3172
3173                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3174                                 sin6.sin6_addr.s6_addr, 16))
3175                         ret = true;
3176         } else {
3177                 struct sockaddr_in * sock_in =
3178                         (struct sockaddr_in *)&np->np_sockaddr;
3179
3180                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3181                         ret = true;
3182         }
3183
3184         return ret;
3185 }
3186
3187 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3188 {
3189         char *payload = NULL;
3190         struct iscsi_conn *conn = cmd->conn;
3191         struct iscsi_portal_group *tpg;
3192         struct iscsi_tiqn *tiqn;
3193         struct iscsi_tpg_np *tpg_np;
3194         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3195         unsigned char buf[256];
3196
3197         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3198                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3199
3200         memset(buf, 0, 256);
3201
3202         payload = kzalloc(buffer_len, GFP_KERNEL);
3203         if (!payload) {
3204                 pr_err("Unable to allocate memory for sendtargets"
3205                                 " response.\n");
3206                 return -ENOMEM;
3207         }
3208
3209         spin_lock(&tiqn_lock);
3210         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3211                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3212                 len += 1;
3213
3214                 if ((len + payload_len) > buffer_len) {
3215                         end_of_buf = 1;
3216                         goto eob;
3217                 }
3218                 memcpy((void *)payload + payload_len, buf, len);
3219                 payload_len += len;
3220
3221                 spin_lock(&tiqn->tiqn_tpg_lock);
3222                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3223
3224                         spin_lock(&tpg->tpg_state_lock);
3225                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3226                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3227                                 spin_unlock(&tpg->tpg_state_lock);
3228                                 continue;
3229                         }
3230                         spin_unlock(&tpg->tpg_state_lock);
3231
3232                         spin_lock(&tpg->tpg_np_lock);
3233                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3234                                                 tpg_np_list) {
3235                                 struct iscsi_np *np = tpg_np->tpg_np;
3236                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3237
3238                                 len = sprintf(buf, "TargetAddress="
3239                                         "%s%s%s:%hu,%hu",
3240                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3241                                         "[" : "", (inaddr_any == false) ?
3242                                                 np->np_ip : conn->local_ip,
3243                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3244                                         "]" : "", (inaddr_any == false) ?
3245                                                 np->np_port : conn->local_port,
3246                                         tpg->tpgt);
3247                                 len += 1;
3248
3249                                 if ((len + payload_len) > buffer_len) {
3250                                         spin_unlock(&tpg->tpg_np_lock);
3251                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3252                                         end_of_buf = 1;
3253                                         goto eob;
3254                                 }
3255                                 memcpy((void *)payload + payload_len, buf, len);
3256                                 payload_len += len;
3257                         }
3258                         spin_unlock(&tpg->tpg_np_lock);
3259                 }
3260                 spin_unlock(&tiqn->tiqn_tpg_lock);
3261 eob:
3262                 if (end_of_buf)
3263                         break;
3264         }
3265         spin_unlock(&tiqn_lock);
3266
3267         cmd->buf_ptr = payload;
3268
3269         return payload_len;
3270 }
3271
3272 /*
3273  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3274  *      MaxRecvDataSegmentLength.
3275  */
3276 static int iscsit_send_text_rsp(
3277         struct iscsi_cmd *cmd,
3278         struct iscsi_conn *conn)
3279 {
3280         struct iscsi_text_rsp *hdr;
3281         struct kvec *iov;
3282         u32 padding = 0, tx_size = 0;
3283         int text_length, iov_count = 0;
3284
3285         text_length = iscsit_build_sendtargets_response(cmd);
3286         if (text_length < 0)
3287                 return text_length;
3288
3289         padding = ((-text_length) & 3);
3290         if (padding != 0) {
3291                 memset(cmd->buf_ptr + text_length, 0, padding);
3292                 pr_debug("Attaching %u additional bytes for"
3293                         " padding.\n", padding);
3294         }
3295
3296         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3297         memset(hdr, 0, ISCSI_HDR_LEN);
3298         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3299         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3300         hton24(hdr->dlength, text_length);
3301         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3302         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3303         cmd->stat_sn            = conn->stat_sn++;
3304         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3305
3306         iscsit_increment_maxcmdsn(cmd, conn->sess);
3307         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3308         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3309
3310         iov = &cmd->iov_misc[0];
3311
3312         iov[iov_count].iov_base = cmd->pdu;
3313         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3314         iov[iov_count].iov_base = cmd->buf_ptr;
3315         iov[iov_count++].iov_len = text_length + padding;
3316
3317         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3318
3319         if (conn->conn_ops->HeaderDigest) {
3320                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3321
3322                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3323                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3324                                 0, NULL, (u8 *)header_digest);
3325
3326                 iov[0].iov_len += ISCSI_CRC_LEN;
3327                 tx_size += ISCSI_CRC_LEN;
3328                 pr_debug("Attaching CRC32 HeaderDigest for"
3329                         " Text Response PDU 0x%08x\n", *header_digest);
3330         }
3331
3332         if (conn->conn_ops->DataDigest) {
3333                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3334                                 cmd->buf_ptr, (text_length + padding),
3335                                 0, NULL, (u8 *)&cmd->data_crc);
3336
3337                 iov[iov_count].iov_base = &cmd->data_crc;
3338                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3339                 tx_size += ISCSI_CRC_LEN;
3340
3341                 pr_debug("Attaching DataDigest for %u bytes of text"
3342                         " data, CRC 0x%08x\n", (text_length + padding),
3343                         cmd->data_crc);
3344         }
3345
3346         cmd->iov_misc_count = iov_count;
3347         cmd->tx_size = tx_size;
3348
3349         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3350                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3351                         text_length, conn->cid);
3352         return 0;
3353 }
3354
3355 static int iscsit_send_reject(
3356         struct iscsi_cmd *cmd,
3357         struct iscsi_conn *conn)
3358 {
3359         u32 iov_count = 0, tx_size = 0;
3360         struct iscsi_reject *hdr;
3361         struct kvec *iov;
3362
3363         hdr                     = (struct iscsi_reject *) cmd->pdu;
3364         hdr->opcode             = ISCSI_OP_REJECT;
3365         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3366         hton24(hdr->dlength, ISCSI_HDR_LEN);
3367         hdr->ffffffff           = 0xffffffff;
3368         cmd->stat_sn            = conn->stat_sn++;
3369         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3370         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3371         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3372
3373         iov = &cmd->iov_misc[0];
3374
3375         iov[iov_count].iov_base = cmd->pdu;
3376         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3377         iov[iov_count].iov_base = cmd->buf_ptr;
3378         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3379
3380         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3381
3382         if (conn->conn_ops->HeaderDigest) {
3383                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3384
3385                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3386                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3387                                 0, NULL, (u8 *)header_digest);
3388
3389                 iov[0].iov_len += ISCSI_CRC_LEN;
3390                 tx_size += ISCSI_CRC_LEN;
3391                 pr_debug("Attaching CRC32 HeaderDigest for"
3392                         " REJECT PDU 0x%08x\n", *header_digest);
3393         }
3394
3395         if (conn->conn_ops->DataDigest) {
3396                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3397                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3398                                 0, NULL, (u8 *)&cmd->data_crc);
3399
3400                 iov[iov_count].iov_base = &cmd->data_crc;
3401                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3402                 tx_size += ISCSI_CRC_LEN;
3403                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3404                                 " PDU 0x%08x\n", cmd->data_crc);
3405         }
3406
3407         cmd->iov_misc_count = iov_count;
3408         cmd->tx_size = tx_size;
3409
3410         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3411                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3412
3413         return 0;
3414 }
3415
3416 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3417 {
3418         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3419             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3420                 wait_for_completion_interruptible_timeout(
3421                                         &conn->tx_half_close_comp,
3422                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3423         }
3424 }
3425
3426 #ifdef CONFIG_SMP
3427
3428 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3429 {
3430         struct iscsi_thread_set *ts = conn->thread_set;
3431         int ord, cpu;
3432         /*
3433          * thread_id is assigned from iscsit_global->ts_bitmap from
3434          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3435          *
3436          * Here we use thread_id to determine which CPU that this
3437          * iSCSI connection's iscsi_thread_set will be scheduled to
3438          * execute upon.
3439          */
3440         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3441 #if 0
3442         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3443                         " thread_id: %d\n", ord, ts->thread_id);
3444 #endif
3445         for_each_online_cpu(cpu) {
3446                 if (ord-- == 0) {
3447                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3448                         return;
3449                 }
3450         }
3451         /*
3452          * This should never be reached..
3453          */
3454         dump_stack();
3455         cpumask_setall(conn->conn_cpumask);
3456 }
3457
3458 static inline void iscsit_thread_check_cpumask(
3459         struct iscsi_conn *conn,
3460         struct task_struct *p,
3461         int mode)
3462 {
3463         char buf[128];
3464         /*
3465          * mode == 1 signals iscsi_target_tx_thread() usage.
3466          * mode == 0 signals iscsi_target_rx_thread() usage.
3467          */
3468         if (mode == 1) {
3469                 if (!conn->conn_tx_reset_cpumask)
3470                         return;
3471                 conn->conn_tx_reset_cpumask = 0;
3472         } else {
3473                 if (!conn->conn_rx_reset_cpumask)
3474                         return;
3475                 conn->conn_rx_reset_cpumask = 0;
3476         }
3477         /*
3478          * Update the CPU mask for this single kthread so that
3479          * both TX and RX kthreads are scheduled to run on the
3480          * same CPU.
3481          */
3482         memset(buf, 0, 128);
3483         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3484 #if 0
3485         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3486                         " %s for %s\n", buf, p->comm);
3487 #endif
3488         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3489 }
3490
3491 #else
3492
3493 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3494 {
3495         return;
3496 }
3497
3498 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3499 #endif /* CONFIG_SMP */
3500
3501 int iscsi_target_tx_thread(void *arg)
3502 {
3503         u8 state;
3504         int eodr = 0;
3505         int ret = 0;
3506         int sent_status = 0;
3507         int use_misc = 0;
3508         int map_sg = 0;
3509         struct iscsi_cmd *cmd = NULL;
3510         struct iscsi_conn *conn;
3511         struct iscsi_queue_req *qr = NULL;
3512         struct se_cmd *se_cmd;
3513         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3514         /*
3515          * Allow ourselves to be interrupted by SIGINT so that a
3516          * connection recovery / failure event can be triggered externally.
3517          */
3518         allow_signal(SIGINT);
3519
3520 restart:
3521         conn = iscsi_tx_thread_pre_handler(ts);
3522         if (!conn)
3523                 goto out;
3524
3525         eodr = map_sg = ret = sent_status = use_misc = 0;
3526
3527         while (!kthread_should_stop()) {
3528                 /*
3529                  * Ensure that both TX and RX per connection kthreads
3530                  * are scheduled to run on the same CPU.
3531                  */
3532                 iscsit_thread_check_cpumask(conn, current, 1);
3533
3534                 wait_event_interruptible(conn->queues_wq,
3535                                          !iscsit_conn_all_queues_empty(conn) ||
3536                                          ts->status == ISCSI_THREAD_SET_RESET);
3537
3538                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3539                      signal_pending(current))
3540                         goto transport_err;
3541
3542 get_immediate:
3543                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3544                 if (qr) {
3545                         atomic_set(&conn->check_immediate_queue, 0);
3546                         cmd = qr->cmd;
3547                         state = qr->state;
3548                         kmem_cache_free(lio_qr_cache, qr);
3549
3550                         spin_lock_bh(&cmd->istate_lock);
3551                         switch (state) {
3552                         case ISTATE_SEND_R2T:
3553                                 spin_unlock_bh(&cmd->istate_lock);
3554                                 ret = iscsit_send_r2t(cmd, conn);
3555                                 break;
3556                         case ISTATE_REMOVE:
3557                                 spin_unlock_bh(&cmd->istate_lock);
3558
3559                                 if (cmd->data_direction == DMA_TO_DEVICE)
3560                                         iscsit_stop_dataout_timer(cmd);
3561
3562                                 spin_lock_bh(&conn->cmd_lock);
3563                                 list_del(&cmd->i_list);
3564                                 spin_unlock_bh(&conn->cmd_lock);
3565
3566                                 iscsit_free_cmd(cmd);
3567                                 goto get_immediate;
3568                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3569                                 spin_unlock_bh(&cmd->istate_lock);
3570                                 iscsit_mod_nopin_response_timer(conn);
3571                                 ret = iscsit_send_unsolicited_nopin(cmd,
3572                                                 conn, 1);
3573                                 break;
3574                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3575                                 spin_unlock_bh(&cmd->istate_lock);
3576                                 ret = iscsit_send_unsolicited_nopin(cmd,
3577                                                 conn, 0);
3578                                 break;
3579                         default:
3580                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3581                                 " 0x%08x, i_state: %d on CID: %hu\n",
3582                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3583                                 conn->cid);
3584                                 spin_unlock_bh(&cmd->istate_lock);
3585                                 goto transport_err;
3586                         }
3587                         if (ret < 0) {
3588                                 conn->tx_immediate_queue = 0;
3589                                 goto transport_err;
3590                         }
3591
3592                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3593                                 conn->tx_immediate_queue = 0;
3594                                 iscsit_tx_thread_wait_for_tcp(conn);
3595                                 goto transport_err;
3596                         }
3597
3598                         spin_lock_bh(&cmd->istate_lock);
3599                         switch (state) {
3600                         case ISTATE_SEND_R2T:
3601                                 spin_unlock_bh(&cmd->istate_lock);
3602                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3603                                 iscsit_start_dataout_timer(cmd, conn);
3604                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3605                                 break;
3606                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3607                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3608                                 spin_unlock_bh(&cmd->istate_lock);
3609                                 break;
3610                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3611                                 cmd->i_state = ISTATE_SENT_STATUS;
3612                                 spin_unlock_bh(&cmd->istate_lock);
3613                                 break;
3614                         default:
3615                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3616                                         " 0x%08x, i_state: %d on CID: %hu\n",
3617                                         cmd->iscsi_opcode, cmd->init_task_tag,
3618                                         state, conn->cid);
3619                                 spin_unlock_bh(&cmd->istate_lock);
3620                                 goto transport_err;
3621                         }
3622                         goto get_immediate;
3623                 } else
3624                         conn->tx_immediate_queue = 0;
3625
3626 get_response:
3627                 qr = iscsit_get_cmd_from_response_queue(conn);
3628                 if (qr) {
3629                         cmd = qr->cmd;
3630                         state = qr->state;
3631                         kmem_cache_free(lio_qr_cache, qr);
3632
3633                         spin_lock_bh(&cmd->istate_lock);
3634 check_rsp_state:
3635                         switch (state) {
3636                         case ISTATE_SEND_DATAIN:
3637                                 spin_unlock_bh(&cmd->istate_lock);
3638                                 ret = iscsit_send_data_in(cmd, conn,
3639                                                           &eodr);
3640                                 map_sg = 1;
3641                                 break;
3642                         case ISTATE_SEND_STATUS:
3643                         case ISTATE_SEND_STATUS_RECOVERY:
3644                                 spin_unlock_bh(&cmd->istate_lock);
3645                                 use_misc = 1;
3646                                 ret = iscsit_send_status(cmd, conn);
3647                                 break;
3648                         case ISTATE_SEND_LOGOUTRSP:
3649                                 spin_unlock_bh(&cmd->istate_lock);
3650                                 use_misc = 1;
3651                                 ret = iscsit_send_logout_response(cmd, conn);
3652                                 break;
3653                         case ISTATE_SEND_ASYNCMSG:
3654                                 spin_unlock_bh(&cmd->istate_lock);
3655                                 use_misc = 1;
3656                                 ret = iscsit_send_conn_drop_async_message(
3657                                                 cmd, conn);
3658                                 break;
3659                         case ISTATE_SEND_NOPIN:
3660                                 spin_unlock_bh(&cmd->istate_lock);
3661                                 use_misc = 1;
3662                                 ret = iscsit_send_nopin_response(cmd, conn);
3663                                 break;
3664                         case ISTATE_SEND_REJECT:
3665                                 spin_unlock_bh(&cmd->istate_lock);
3666                                 use_misc = 1;
3667                                 ret = iscsit_send_reject(cmd, conn);
3668                                 break;
3669                         case ISTATE_SEND_TASKMGTRSP:
3670                                 spin_unlock_bh(&cmd->istate_lock);
3671                                 use_misc = 1;
3672                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3673                                 if (ret != 0)
3674                                         break;
3675                                 ret = iscsit_tmr_post_handler(cmd, conn);
3676                                 if (ret != 0)
3677                                         iscsit_fall_back_to_erl0(conn->sess);
3678                                 break;
3679                         case ISTATE_SEND_TEXTRSP:
3680                                 spin_unlock_bh(&cmd->istate_lock);
3681                                 use_misc = 1;
3682                                 ret = iscsit_send_text_rsp(cmd, conn);
3683                                 break;
3684                         default:
3685                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3686                                         " 0x%08x, i_state: %d on CID: %hu\n",
3687                                         cmd->iscsi_opcode, cmd->init_task_tag,
3688                                         state, conn->cid);
3689                                 spin_unlock_bh(&cmd->istate_lock);
3690                                 goto transport_err;
3691                         }
3692                         if (ret < 0) {
3693                                 conn->tx_response_queue = 0;
3694                                 goto transport_err;
3695                         }
3696
3697                         se_cmd = &cmd->se_cmd;
3698
3699                         if (map_sg && !conn->conn_ops->IFMarker) {
3700                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3701                                         conn->tx_response_queue = 0;
3702                                         iscsit_tx_thread_wait_for_tcp(conn);
3703                                         iscsit_unmap_iovec(cmd);
3704                                         goto transport_err;
3705                                 }
3706                         } else {
3707                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3708                                         conn->tx_response_queue = 0;
3709                                         iscsit_tx_thread_wait_for_tcp(conn);
3710                                         iscsit_unmap_iovec(cmd);
3711                                         goto transport_err;
3712                                 }
3713                         }
3714                         map_sg = 0;
3715                         iscsit_unmap_iovec(cmd);
3716
3717                         spin_lock_bh(&cmd->istate_lock);
3718                         switch (state) {
3719                         case ISTATE_SEND_DATAIN:
3720                                 if (!eodr)
3721                                         goto check_rsp_state;
3722
3723                                 if (eodr == 1) {
3724                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3725                                         sent_status = 1;
3726                                         eodr = use_misc = 0;
3727                                 } else if (eodr == 2) {
3728                                         cmd->i_state = state =
3729                                                         ISTATE_SEND_STATUS;
3730                                         sent_status = 0;
3731                                         eodr = use_misc = 0;
3732                                         goto check_rsp_state;
3733                                 }
3734                                 break;
3735                         case ISTATE_SEND_STATUS:
3736                                 use_misc = 0;
3737                                 sent_status = 1;
3738                                 break;
3739                         case ISTATE_SEND_ASYNCMSG:
3740                         case ISTATE_SEND_NOPIN:
3741                         case ISTATE_SEND_STATUS_RECOVERY:
3742                         case ISTATE_SEND_TEXTRSP:
3743                                 use_misc = 0;
3744                                 sent_status = 1;
3745                                 break;
3746                         case ISTATE_SEND_REJECT:
3747                                 use_misc = 0;
3748                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3749                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3750                                         spin_unlock_bh(&cmd->istate_lock);
3751                                         complete(&cmd->reject_comp);
3752                                         goto transport_err;
3753                                 }
3754                                 complete(&cmd->reject_comp);
3755                                 break;
3756                         case ISTATE_SEND_TASKMGTRSP:
3757                                 use_misc = 0;
3758                                 sent_status = 1;
3759                                 break;
3760                         case ISTATE_SEND_LOGOUTRSP:
3761                                 spin_unlock_bh(&cmd->istate_lock);
3762                                 if (!iscsit_logout_post_handler(cmd, conn))
3763                                         goto restart;
3764                                 spin_lock_bh(&cmd->istate_lock);
3765                                 use_misc = 0;
3766                                 sent_status = 1;
3767                                 break;
3768                         default:
3769                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3770                                         " 0x%08x, i_state: %d on CID: %hu\n",
3771                                         cmd->iscsi_opcode, cmd->init_task_tag,
3772                                         cmd->i_state, conn->cid);
3773                                 spin_unlock_bh(&cmd->istate_lock);
3774                                 goto transport_err;
3775                         }
3776
3777                         if (sent_status) {
3778                                 cmd->i_state = ISTATE_SENT_STATUS;
3779                                 sent_status = 0;
3780                         }
3781                         spin_unlock_bh(&cmd->istate_lock);
3782
3783                         if (atomic_read(&conn->check_immediate_queue))
3784                                 goto get_immediate;
3785
3786                         goto get_response;
3787                 } else
3788                         conn->tx_response_queue = 0;
3789         }
3790
3791 transport_err:
3792         iscsit_take_action_for_connection_exit(conn);
3793         goto restart;
3794 out:
3795         return 0;
3796 }
3797
3798 int iscsi_target_rx_thread(void *arg)
3799 {
3800         int ret;
3801         u8 buffer[ISCSI_HDR_LEN], opcode;
3802         u32 checksum = 0, digest = 0;
3803         struct iscsi_conn *conn = NULL;
3804         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3805         struct kvec iov;
3806         /*
3807          * Allow ourselves to be interrupted by SIGINT so that a
3808          * connection recovery / failure event can be triggered externally.
3809          */
3810         allow_signal(SIGINT);
3811
3812 restart:
3813         conn = iscsi_rx_thread_pre_handler(ts);
3814         if (!conn)
3815                 goto out;
3816
3817         while (!kthread_should_stop()) {
3818                 /*
3819                  * Ensure that both TX and RX per connection kthreads
3820                  * are scheduled to run on the same CPU.
3821                  */
3822                 iscsit_thread_check_cpumask(conn, current, 0);
3823
3824                 memset(buffer, 0, ISCSI_HDR_LEN);
3825                 memset(&iov, 0, sizeof(struct kvec));
3826
3827                 iov.iov_base    = buffer;
3828                 iov.iov_len     = ISCSI_HDR_LEN;
3829
3830                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3831                 if (ret != ISCSI_HDR_LEN) {
3832                         iscsit_rx_thread_wait_for_tcp(conn);
3833                         goto transport_err;
3834                 }
3835
3836                 /*
3837                  * Set conn->bad_hdr for use with REJECT PDUs.
3838                  */
3839                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3840
3841                 if (conn->conn_ops->HeaderDigest) {
3842                         iov.iov_base    = &digest;
3843                         iov.iov_len     = ISCSI_CRC_LEN;
3844
3845                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3846                         if (ret != ISCSI_CRC_LEN) {
3847                                 iscsit_rx_thread_wait_for_tcp(conn);
3848                                 goto transport_err;
3849                         }
3850
3851                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3852                                         buffer, ISCSI_HDR_LEN,
3853                                         0, NULL, (u8 *)&checksum);
3854
3855                         if (digest != checksum) {
3856                                 pr_err("HeaderDigest CRC32C failed,"
3857                                         " received 0x%08x, computed 0x%08x\n",
3858                                         digest, checksum);
3859                                 /*
3860                                  * Set the PDU to 0xff so it will intentionally
3861                                  * hit default in the switch below.
3862                                  */
3863                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3864                                 spin_lock_bh(&conn->sess->session_stats_lock);
3865                                 conn->sess->conn_digest_errors++;
3866                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3867                         } else {
3868                                 pr_debug("Got HeaderDigest CRC32C"
3869                                                 " 0x%08x\n", checksum);
3870                         }
3871                 }
3872
3873                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3874                         goto transport_err;
3875
3876                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3877
3878                 if (conn->sess->sess_ops->SessionType &&
3879                    ((!(opcode & ISCSI_OP_TEXT)) ||
3880                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3881                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3882                         " while in Discovery Session, rejecting.\n", opcode);
3883                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3884                                         buffer, conn);
3885                         goto transport_err;
3886                 }
3887
3888                 switch (opcode) {
3889                 case ISCSI_OP_SCSI_CMD:
3890                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3891                                 goto transport_err;
3892                         break;
3893                 case ISCSI_OP_SCSI_DATA_OUT:
3894                         if (iscsit_handle_data_out(conn, buffer) < 0)
3895                                 goto transport_err;
3896                         break;
3897                 case ISCSI_OP_NOOP_OUT:
3898                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3899                                 goto transport_err;
3900                         break;
3901                 case ISCSI_OP_SCSI_TMFUNC:
3902                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3903                                 goto transport_err;
3904                         break;
3905                 case ISCSI_OP_TEXT:
3906                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3907                                 goto transport_err;
3908                         break;
3909                 case ISCSI_OP_LOGOUT:
3910                         ret = iscsit_handle_logout_cmd(conn, buffer);
3911                         if (ret > 0) {
3912                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3913                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3914                                 goto transport_err;
3915                         } else if (ret < 0)
3916                                 goto transport_err;
3917                         break;
3918                 case ISCSI_OP_SNACK:
3919                         if (iscsit_handle_snack(conn, buffer) < 0)
3920                                 goto transport_err;
3921                         break;
3922                 default:
3923                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3924                                         opcode);
3925                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3926                                 pr_err("Cannot recover from unknown"
3927                                 " opcode while ERL=0, closing iSCSI connection"
3928                                 ".\n");
3929                                 goto transport_err;
3930                         }
3931                         if (!conn->conn_ops->OFMarker) {
3932                                 pr_err("Unable to recover from unknown"
3933                                 " opcode while OFMarker=No, closing iSCSI"
3934                                         " connection.\n");
3935                                 goto transport_err;
3936                         }
3937                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3938                                 pr_err("Unable to recover from unknown"
3939                                         " opcode, closing iSCSI connection.\n");
3940                                 goto transport_err;
3941                         }
3942                         break;
3943                 }
3944         }
3945
3946 transport_err:
3947         if (!signal_pending(current))
3948                 atomic_set(&conn->transport_failed, 1);
3949         iscsit_take_action_for_connection_exit(conn);
3950         goto restart;
3951 out:
3952         return 0;
3953 }
3954
3955 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3956 {
3957         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3958         struct iscsi_session *sess = conn->sess;
3959         /*
3960          * We expect this function to only ever be called from either RX or TX
3961          * thread context via iscsit_close_connection() once the other context
3962          * has been reset -> returned sleeping pre-handler state.
3963          */
3964         spin_lock_bh(&conn->cmd_lock);
3965         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3966
3967                 list_del(&cmd->i_list);
3968                 spin_unlock_bh(&conn->cmd_lock);
3969
3970                 iscsit_increment_maxcmdsn(cmd, sess);
3971
3972                 iscsit_free_cmd(cmd);
3973
3974                 spin_lock_bh(&conn->cmd_lock);
3975         }
3976         spin_unlock_bh(&conn->cmd_lock);
3977 }
3978
3979 static void iscsit_stop_timers_for_cmds(
3980         struct iscsi_conn *conn)
3981 {
3982         struct iscsi_cmd *cmd;
3983
3984         spin_lock_bh(&conn->cmd_lock);
3985         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3986                 if (cmd->data_direction == DMA_TO_DEVICE)
3987                         iscsit_stop_dataout_timer(cmd);
3988         }
3989         spin_unlock_bh(&conn->cmd_lock);
3990 }
3991
3992 int iscsit_close_connection(
3993         struct iscsi_conn *conn)
3994 {
3995         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3996         struct iscsi_session    *sess = conn->sess;
3997
3998         pr_debug("Closing iSCSI connection CID %hu on SID:"
3999                 " %u\n", conn->cid, sess->sid);
4000         /*
4001          * Always up conn_logout_comp just in case the RX Thread is sleeping
4002          * and the logout response never got sent because the connection
4003          * failed.
4004          */
4005         complete(&conn->conn_logout_comp);
4006
4007         iscsi_release_thread_set(conn);
4008
4009         iscsit_stop_timers_for_cmds(conn);
4010         iscsit_stop_nopin_response_timer(conn);
4011         iscsit_stop_nopin_timer(conn);
4012         iscsit_free_queue_reqs_for_conn(conn);
4013
4014         /*
4015          * During Connection recovery drop unacknowledged out of order
4016          * commands for this connection, and prepare the other commands
4017          * for realligence.
4018          *
4019          * During normal operation clear the out of order commands (but
4020          * do not free the struct iscsi_ooo_cmdsn's) and release all
4021          * struct iscsi_cmds.
4022          */
4023         if (atomic_read(&conn->connection_recovery)) {
4024                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4025                 iscsit_prepare_cmds_for_realligance(conn);
4026         } else {
4027                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4028                 iscsit_release_commands_from_conn(conn);
4029         }
4030
4031         /*
4032          * Handle decrementing session or connection usage count if
4033          * a logout response was not able to be sent because the
4034          * connection failed.  Fall back to Session Recovery here.
4035          */
4036         if (atomic_read(&conn->conn_logout_remove)) {
4037                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4038                         iscsit_dec_conn_usage_count(conn);
4039                         iscsit_dec_session_usage_count(sess);
4040                 }
4041                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4042                         iscsit_dec_conn_usage_count(conn);
4043
4044                 atomic_set(&conn->conn_logout_remove, 0);
4045                 atomic_set(&sess->session_reinstatement, 0);
4046                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4047         }
4048
4049         spin_lock_bh(&sess->conn_lock);
4050         list_del(&conn->conn_list);
4051
4052         /*
4053          * Attempt to let the Initiator know this connection failed by
4054          * sending an Connection Dropped Async Message on another
4055          * active connection.
4056          */
4057         if (atomic_read(&conn->connection_recovery))
4058                 iscsit_build_conn_drop_async_message(conn);
4059
4060         spin_unlock_bh(&sess->conn_lock);
4061
4062         /*
4063          * If connection reinstatement is being performed on this connection,
4064          * up the connection reinstatement semaphore that is being blocked on
4065          * in iscsit_cause_connection_reinstatement().
4066          */
4067         spin_lock_bh(&conn->state_lock);
4068         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4069                 spin_unlock_bh(&conn->state_lock);
4070                 complete(&conn->conn_wait_comp);
4071                 wait_for_completion(&conn->conn_post_wait_comp);
4072                 spin_lock_bh(&conn->state_lock);
4073         }
4074
4075         /*
4076          * If connection reinstatement is being performed on this connection
4077          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4078          * connection wait rcfr semaphore that is being blocked on
4079          * an iscsit_connection_reinstatement_rcfr().
4080          */
4081         if (atomic_read(&conn->connection_wait_rcfr)) {
4082                 spin_unlock_bh(&conn->state_lock);
4083                 complete(&conn->conn_wait_rcfr_comp);
4084                 wait_for_completion(&conn->conn_post_wait_comp);
4085                 spin_lock_bh(&conn->state_lock);
4086         }
4087         atomic_set(&conn->connection_reinstatement, 1);
4088         spin_unlock_bh(&conn->state_lock);
4089
4090         /*
4091          * If any other processes are accessing this connection pointer we
4092          * must wait until they have completed.
4093          */
4094         iscsit_check_conn_usage_count(conn);
4095
4096         if (conn->conn_rx_hash.tfm)
4097                 crypto_free_hash(conn->conn_rx_hash.tfm);
4098         if (conn->conn_tx_hash.tfm)
4099                 crypto_free_hash(conn->conn_tx_hash.tfm);
4100
4101         if (conn->conn_cpumask)
4102                 free_cpumask_var(conn->conn_cpumask);
4103
4104         kfree(conn->conn_ops);
4105         conn->conn_ops = NULL;
4106
4107         if (conn->sock)
4108                 sock_release(conn->sock);
4109         conn->thread_set = NULL;
4110
4111         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4112         conn->conn_state = TARG_CONN_STATE_FREE;
4113         kfree(conn);
4114
4115         spin_lock_bh(&sess->conn_lock);
4116         atomic_dec(&sess->nconn);
4117         pr_debug("Decremented iSCSI connection count to %hu from node:"
4118                 " %s\n", atomic_read(&sess->nconn),
4119                 sess->sess_ops->InitiatorName);
4120         /*
4121          * Make sure that if one connection fails in an non ERL=2 iSCSI
4122          * Session that they all fail.
4123          */
4124         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4125              !atomic_read(&sess->session_logout))
4126                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4127
4128         /*
4129          * If this was not the last connection in the session, and we are
4130          * performing session reinstatement or falling back to ERL=0, call
4131          * iscsit_stop_session() without sleeping to shutdown the other
4132          * active connections.
4133          */
4134         if (atomic_read(&sess->nconn)) {
4135                 if (!atomic_read(&sess->session_reinstatement) &&
4136                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4137                         spin_unlock_bh(&sess->conn_lock);
4138                         return 0;
4139                 }
4140                 if (!atomic_read(&sess->session_stop_active)) {
4141                         atomic_set(&sess->session_stop_active, 1);
4142                         spin_unlock_bh(&sess->conn_lock);
4143                         iscsit_stop_session(sess, 0, 0);
4144                         return 0;
4145                 }
4146                 spin_unlock_bh(&sess->conn_lock);
4147                 return 0;
4148         }
4149
4150         /*
4151          * If this was the last connection in the session and one of the
4152          * following is occurring:
4153          *
4154          * Session Reinstatement is not being performed, and are falling back
4155          * to ERL=0 call iscsit_close_session().
4156          *
4157          * Session Logout was requested.  iscsit_close_session() will be called
4158          * elsewhere.
4159          *
4160          * Session Continuation is not being performed, start the Time2Retain
4161          * handler and check if sleep_on_sess_wait_sem is active.
4162          */
4163         if (!atomic_read(&sess->session_reinstatement) &&
4164              atomic_read(&sess->session_fall_back_to_erl0)) {
4165                 spin_unlock_bh(&sess->conn_lock);
4166                 iscsit_close_session(sess);
4167
4168                 return 0;
4169         } else if (atomic_read(&sess->session_logout)) {
4170                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4171                 sess->session_state = TARG_SESS_STATE_FREE;
4172                 spin_unlock_bh(&sess->conn_lock);
4173
4174                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4175                         complete(&sess->session_wait_comp);
4176
4177                 return 0;
4178         } else {
4179                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4180                 sess->session_state = TARG_SESS_STATE_FAILED;
4181
4182                 if (!atomic_read(&sess->session_continuation)) {
4183                         spin_unlock_bh(&sess->conn_lock);
4184                         iscsit_start_time2retain_handler(sess);
4185                 } else
4186                         spin_unlock_bh(&sess->conn_lock);
4187
4188                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4189                         complete(&sess->session_wait_comp);
4190
4191                 return 0;
4192         }
4193         spin_unlock_bh(&sess->conn_lock);
4194
4195         return 0;
4196 }
4197
4198 int iscsit_close_session(struct iscsi_session *sess)
4199 {
4200         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4201         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4202
4203         if (atomic_read(&sess->nconn)) {
4204                 pr_err("%d connection(s) still exist for iSCSI session"
4205                         " to %s\n", atomic_read(&sess->nconn),
4206                         sess->sess_ops->InitiatorName);
4207                 BUG();
4208         }
4209
4210         spin_lock_bh(&se_tpg->session_lock);
4211         atomic_set(&sess->session_logout, 1);
4212         atomic_set(&sess->session_reinstatement, 1);
4213         iscsit_stop_time2retain_timer(sess);
4214         spin_unlock_bh(&se_tpg->session_lock);
4215
4216         /*
4217          * transport_deregister_session_configfs() will clear the
4218          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4219          * can be setting it again with __transport_register_session() in
4220          * iscsi_post_login_handler() again after the iscsit_stop_session()
4221          * completes in iscsi_np context.
4222          */
4223         transport_deregister_session_configfs(sess->se_sess);
4224
4225         /*
4226          * If any other processes are accessing this session pointer we must
4227          * wait until they have completed.  If we are in an interrupt (the
4228          * time2retain handler) and contain and active session usage count we
4229          * restart the timer and exit.
4230          */
4231         if (!in_interrupt()) {
4232                 if (iscsit_check_session_usage_count(sess) == 1)
4233                         iscsit_stop_session(sess, 1, 1);
4234         } else {
4235                 if (iscsit_check_session_usage_count(sess) == 2) {
4236                         atomic_set(&sess->session_logout, 0);
4237                         iscsit_start_time2retain_handler(sess);
4238                         return 0;
4239                 }
4240         }
4241
4242         transport_deregister_session(sess->se_sess);
4243
4244         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4245                 iscsit_free_connection_recovery_entires(sess);
4246
4247         iscsit_free_all_ooo_cmdsns(sess);
4248
4249         spin_lock_bh(&se_tpg->session_lock);
4250         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4251         sess->session_state = TARG_SESS_STATE_FREE;
4252         pr_debug("Released iSCSI session from node: %s\n",
4253                         sess->sess_ops->InitiatorName);
4254         tpg->nsessions--;
4255         if (tpg->tpg_tiqn)
4256                 tpg->tpg_tiqn->tiqn_nsessions--;
4257
4258         pr_debug("Decremented number of active iSCSI Sessions on"
4259                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4260
4261         spin_lock(&sess_idr_lock);
4262         idr_remove(&sess_idr, sess->session_index);
4263         spin_unlock(&sess_idr_lock);
4264
4265         kfree(sess->sess_ops);
4266         sess->sess_ops = NULL;
4267         spin_unlock_bh(&se_tpg->session_lock);
4268
4269         kfree(sess);
4270         return 0;
4271 }
4272
4273 static void iscsit_logout_post_handler_closesession(
4274         struct iscsi_conn *conn)
4275 {
4276         struct iscsi_session *sess = conn->sess;
4277
4278         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4279         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4280
4281         atomic_set(&conn->conn_logout_remove, 0);
4282         complete(&conn->conn_logout_comp);
4283
4284         iscsit_dec_conn_usage_count(conn);
4285         iscsit_stop_session(sess, 1, 1);
4286         iscsit_dec_session_usage_count(sess);
4287         iscsit_close_session(sess);
4288 }
4289
4290 static void iscsit_logout_post_handler_samecid(
4291         struct iscsi_conn *conn)
4292 {
4293         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4294         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4295
4296         atomic_set(&conn->conn_logout_remove, 0);
4297         complete(&conn->conn_logout_comp);
4298
4299         iscsit_cause_connection_reinstatement(conn, 1);
4300         iscsit_dec_conn_usage_count(conn);
4301 }
4302
4303 static void iscsit_logout_post_handler_diffcid(
4304         struct iscsi_conn *conn,
4305         u16 cid)
4306 {
4307         struct iscsi_conn *l_conn;
4308         struct iscsi_session *sess = conn->sess;
4309         bool conn_found = false;
4310
4311         if (!sess)
4312                 return;
4313
4314         spin_lock_bh(&sess->conn_lock);
4315         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4316                 if (l_conn->cid == cid) {
4317                         iscsit_inc_conn_usage_count(l_conn);
4318                         conn_found = true;
4319                         break;
4320                 }
4321         }
4322         spin_unlock_bh(&sess->conn_lock);
4323
4324         if (!conn_found)
4325                 return;
4326
4327         if (l_conn->sock)
4328                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4329
4330         spin_lock_bh(&l_conn->state_lock);
4331         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4332         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4333         spin_unlock_bh(&l_conn->state_lock);
4334
4335         iscsit_cause_connection_reinstatement(l_conn, 1);
4336         iscsit_dec_conn_usage_count(l_conn);
4337 }
4338
4339 /*
4340  *      Return of 0 causes the TX thread to restart.
4341  */
4342 static int iscsit_logout_post_handler(
4343         struct iscsi_cmd *cmd,
4344         struct iscsi_conn *conn)
4345 {
4346         int ret = 0;
4347
4348         switch (cmd->logout_reason) {
4349         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4350                 switch (cmd->logout_response) {
4351                 case ISCSI_LOGOUT_SUCCESS:
4352                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4353                 default:
4354                         iscsit_logout_post_handler_closesession(conn);
4355                         break;
4356                 }
4357                 ret = 0;
4358                 break;
4359         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4360                 if (conn->cid == cmd->logout_cid) {
4361                         switch (cmd->logout_response) {
4362                         case ISCSI_LOGOUT_SUCCESS:
4363                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4364                         default:
4365                                 iscsit_logout_post_handler_samecid(conn);
4366                                 break;
4367                         }
4368                         ret = 0;
4369                 } else {
4370                         switch (cmd->logout_response) {
4371                         case ISCSI_LOGOUT_SUCCESS:
4372                                 iscsit_logout_post_handler_diffcid(conn,
4373                                         cmd->logout_cid);
4374                                 break;
4375                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4376                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4377                         default:
4378                                 break;
4379                         }
4380                         ret = 1;
4381                 }
4382                 break;
4383         case ISCSI_LOGOUT_REASON_RECOVERY:
4384                 switch (cmd->logout_response) {
4385                 case ISCSI_LOGOUT_SUCCESS:
4386                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4387                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4388                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4389                 default:
4390                         break;
4391                 }
4392                 ret = 1;
4393                 break;
4394         default:
4395                 break;
4396
4397         }
4398         return ret;
4399 }
4400
4401 void iscsit_fail_session(struct iscsi_session *sess)
4402 {
4403         struct iscsi_conn *conn;
4404
4405         spin_lock_bh(&sess->conn_lock);
4406         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4407                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4408                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4409         }
4410         spin_unlock_bh(&sess->conn_lock);
4411
4412         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4413         sess->session_state = TARG_SESS_STATE_FAILED;
4414 }
4415
4416 int iscsit_free_session(struct iscsi_session *sess)
4417 {
4418         u16 conn_count = atomic_read(&sess->nconn);
4419         struct iscsi_conn *conn, *conn_tmp = NULL;
4420         int is_last;
4421
4422         spin_lock_bh(&sess->conn_lock);
4423         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4424
4425         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4426                         conn_list) {
4427                 if (conn_count == 0)
4428                         break;
4429
4430                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4431                         is_last = 1;
4432                 } else {
4433                         iscsit_inc_conn_usage_count(conn_tmp);
4434                         is_last = 0;
4435                 }
4436                 iscsit_inc_conn_usage_count(conn);
4437
4438                 spin_unlock_bh(&sess->conn_lock);
4439                 iscsit_cause_connection_reinstatement(conn, 1);
4440                 spin_lock_bh(&sess->conn_lock);
4441
4442                 iscsit_dec_conn_usage_count(conn);
4443                 if (is_last == 0)
4444                         iscsit_dec_conn_usage_count(conn_tmp);
4445
4446                 conn_count--;
4447         }
4448
4449         if (atomic_read(&sess->nconn)) {
4450                 spin_unlock_bh(&sess->conn_lock);
4451                 wait_for_completion(&sess->session_wait_comp);
4452         } else
4453                 spin_unlock_bh(&sess->conn_lock);
4454
4455         iscsit_close_session(sess);
4456         return 0;
4457 }
4458
4459 void iscsit_stop_session(
4460         struct iscsi_session *sess,
4461         int session_sleep,
4462         int connection_sleep)
4463 {
4464         u16 conn_count = atomic_read(&sess->nconn);
4465         struct iscsi_conn *conn, *conn_tmp = NULL;
4466         int is_last;
4467
4468         spin_lock_bh(&sess->conn_lock);
4469         if (session_sleep)
4470                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4471
4472         if (connection_sleep) {
4473                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4474                                 conn_list) {
4475                         if (conn_count == 0)
4476                                 break;
4477
4478                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4479                                 is_last = 1;
4480                         } else {
4481                                 iscsit_inc_conn_usage_count(conn_tmp);
4482                                 is_last = 0;
4483                         }
4484                         iscsit_inc_conn_usage_count(conn);
4485
4486                         spin_unlock_bh(&sess->conn_lock);
4487                         iscsit_cause_connection_reinstatement(conn, 1);
4488                         spin_lock_bh(&sess->conn_lock);
4489
4490                         iscsit_dec_conn_usage_count(conn);
4491                         if (is_last == 0)
4492                                 iscsit_dec_conn_usage_count(conn_tmp);
4493                         conn_count--;
4494                 }
4495         } else {
4496                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4497                         iscsit_cause_connection_reinstatement(conn, 0);
4498         }
4499
4500         if (session_sleep && atomic_read(&sess->nconn)) {
4501                 spin_unlock_bh(&sess->conn_lock);
4502                 wait_for_completion(&sess->session_wait_comp);
4503         } else
4504                 spin_unlock_bh(&sess->conn_lock);
4505 }
4506
4507 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4508 {
4509         struct iscsi_session *sess;
4510         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4511         struct se_session *se_sess, *se_sess_tmp;
4512         int session_count = 0;
4513
4514         spin_lock_bh(&se_tpg->session_lock);
4515         if (tpg->nsessions && !force) {
4516                 spin_unlock_bh(&se_tpg->session_lock);
4517                 return -1;
4518         }
4519
4520         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4521                         sess_list) {
4522                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4523
4524                 spin_lock(&sess->conn_lock);
4525                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4526                     atomic_read(&sess->session_logout) ||
4527                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4528                         spin_unlock(&sess->conn_lock);
4529                         continue;
4530                 }
4531                 atomic_set(&sess->session_reinstatement, 1);
4532                 spin_unlock(&sess->conn_lock);
4533                 spin_unlock_bh(&se_tpg->session_lock);
4534
4535                 iscsit_free_session(sess);
4536                 spin_lock_bh(&se_tpg->session_lock);
4537
4538                 session_count++;
4539         }
4540         spin_unlock_bh(&se_tpg->session_lock);
4541
4542         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4543                         " Group: %hu\n", session_count, tpg->tpgt);
4544         return 0;
4545 }
4546
4547 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4548 MODULE_VERSION("4.1.x");
4549 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4550 MODULE_LICENSE("GPL");
4551
4552 module_init(iscsi_target_init_module);
4553 module_exit(iscsi_target_cleanup_module);